Encyclopedia/3. History, Societies & Civilizations/11. Pre-Modern & Modern History • Curated by Admin Timeline.sg
This timeline covers the pivotal events of the Pacific Theater during World War II, from the early Japanese expansion to the Allied victory, highlighting key battles, strategic decisions, and technological breakthroughs that shaped the outcome of the war.
Chronological Storyline (46 Milestones)
Jul 7, 1937 CE
Marco Polo Bridge Incident
A skirmish between Chinese and Japanese troops near Beijing triggers the Second Sino-Japanese War, which becomes part of the broader Pacific conflict. This event marks the beginning of full-scale war in Asia. #WWII #PacificWar #China
Marco Polo Bridge Incident By Sweeper tamonten (talk) - From "Shina Jihen Kinen Shashincho"(memorial photograph collection on Sino-Japanese War for the period between July, 1937 and January, 1940 by photograph squad of military unit headquarters), Public domain, https://commons.wikimedia.org/w/index.php?curid=6953829
Sep 27, 1940 CE
Tripartite Pact Signed
Japan, Germany, and Italy sign the Tripartite Pact, formalizing the Axis alliance. This agreement aligns Japan with the European Axis powers and sets the stage for global conflict. #WWII #Axis #Alliance
Tripartite Pact Signed By Heinrich Hoffmann - Atual: https://nationalinterest.org/blog/buzz/meet-original-axis-evil-hitler-mussolini-and-tojo-145727 Fonte original: http://www.reformation.org/e-tripartite-pact.jpg, original watermark now removed stated "Imperial War Museum". número de catálogo IWM: HU 75995 nome no IWM: The Tripartite Act, September 1940 (Grossdeutschland Im Weltgeschehen: Tages Bildberichte, United Germany in world affairs) data de prdução no IWM: 27 September 1940 criador no IWM: Heinrich Hoffmann tipo de objeto no IWM: Official photograph, Public domain, https://commons.wikimedia.org/w/index.php?curid=140214099
Apr 13, 1941 CE
Soviet-Japanese Neutrality Pact
The Soviet Union and Japan sign a neutrality pact, securing Japan's northern flank and allowing it to focus on Southeast Asia. This pact remains in effect until August 1945. #WWII #Diplomacy #Japan
Soviet-Japanese Neutrality Pact By Николай Сидорович Власик (1896-1967) - http://victory.rusarchives.ru/index.php?p=31&photo_id=996, Public domain, https://commons.wikimedia.org/w/index.php?curid=6094374
Jul 24, 1941 CE
Japanese Invasion of French Indochina
Japan moves into southern Indochina, prompting the United States to impose oil and asset freezes. This escalation leads to increased tensions and sets the stage for Pearl Harbor. #WWII #Japan #Indochina
Japanese Invasion of French Indochina By Unknown author - https://saigoneer.com/old-saigon/old-saigon-categories/2073-when-the-japanese-occupied-vietnam-part-ii, Public domain, https://commons.wikimedia.org/w/index.php?curid=61574194
Dec 7, 1941 CE
Attack on Pearl Harbor
Japan launches a surprise attack on the US naval base at Pearl Harbor, Hawaii, destroying battleships and aircraft. This event brings the United States into World War II. #WWII #PearlHarbor #USA
Attack on Pearl Harbor By Imperial Japanese Navy - Official U.S. Navy photograph NH 50930., Public domain, https://commons.wikimedia.org/w/index.php?curid=223876
Dec 8, 1941 CE
US Declares War on Japan
Following President Roosevelt's 'Day of Infamy' speech, the US Congress declares war on Japan. This marks America's entry into the Pacific War. #WWII #USA #Declaration
US Declares War on Japan By U.S. Government - Extracted from PDF version of Our Flag, available here (direct PDF URL here.), Public domain, https://commons.wikimedia.org/w/index.php?curid=41373752
Dec 10, 1941 CE
Sinking of HMS Prince of Wales and Repulse
Japanese aircraft sink the British battleship Prince of Wales and battlecruiser Repulse off Malaya, demonstrating the vulnerability of surface ships to air attack. This loss weakens Allied naval power in the Pacific. #WWII #Naval #UK
Sinking of HMS Prince of Wales and Repulse By Photograph by Underwood & Underwood - This photograph HU 2762 comes from the collections of the Imperial War Museums., Public domain, https://commons.wikimedia.org/w/index.php?curid=2261354
Dec 25, 1941 CE
Fall of Hong Kong
After a brief but fierce battle, British and Canadian forces surrender Hong Kong to the Japanese. The colony remains under Japanese occupation until 1945. #WWII #HongKong #Japan
Fall of Hong Kong By Mainichi Newpaper, Japan - booklet of "The Battle of Hong Kong- Hong Kong under the camera of the Japanese Army" Exhibition, Hong Kong Museum of History, 2002, Public domain, https://commons.wikimedia.org/w/index.php?curid=4167929
Jan 2, 1942 CE
Japanese Capture of Manila
Japanese forces enter Manila, the capital of the Philippines, forcing US and Filipino troops to retreat to Bataan. The fall of Manila marks a major Japanese victory. #WWII #Philippines #Japan
Feb 15, 1942 CE
Fall of Singapore
Singapore, a key British stronghold, surrenders to Japanese forces in what Churchill calls the 'worst disaster' in British military history. Over 80,000 Allied troops become prisoners of war. #WWII #Singapore #UK
Fall of Singapore By Photographer not identified. "Official photograph". Post-Work: User:W.wolny - This photograph HU 2781 comes from the collections of the Imperial War Museums(collection no. 5707-03), Public domain, https://commons.wikimedia.org/w/index.php?curid=639344
Mar 9, 1942 CE
Dutch East Indies Surrender
Japanese forces complete the conquest of the Dutch East Indies (Indonesia), securing vital oil resources. The Dutch colonial army surrenders after a series of defeats. #WWII #Indonesia #Japan
Dutch East Indies Surrender By Unknown author - Wereldmuseum Amsterdam, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8612320
Apr 9, 1942 CE
Bataan Death March Begins
After the surrender of US and Filipino troops on Bataan, Japanese forces force prisoners to march 65 miles to prison camps. Thousands die from brutality and starvation. #WWII #WarCrimes #Philippines
Bataan Death March Begins By Unknown authorUnknown author or not provided - U.S. National Archives and Records Administration, Public domain, https://commons.wikimedia.org/w/index.php?curid=17043258
Apr 18, 1942 CE
Doolittle Raid on Tokyo
US Army B-25 bombers, launched from the aircraft carrier USS Hornet, bomb Tokyo and other Japanese cities. The raid boosts American morale and forces Japan to reconsider its defense strategy. #WWII #AirRaid #USA
Doolittle Raid on Tokyo By AnonymousUnknown author - This image was released by the United States Air Force with the ID 420418-F-0000D-003.JPG (next). This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing. العربية ∙ বাংলা ∙ Bahaso Jambi ∙ Deutsch ∙ Deutsch (Sie-Form) ∙ English ∙ español ∙ euskara ∙ فارسی ∙ français ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ Plattdüütsch ∙ Nederlands ∙ polski ∙ پښتو ∙ português ∙ русский ∙ slovenščina ∙ svenska ∙ Türkçe ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−, Public domain, https://commons.wikimedia.org/w/index.php?curid=106158565
May 4, 1942 CE
Battle of the Coral Sea
The first naval battle in history where opposing ships never sight each other, fought entirely by aircraft. The US Navy stops the Japanese advance toward Port Moresby, protecting Australia. #WWII #Naval #Australia
Battle of the Coral Sea By Unknown author - U.S. Navy photo 80-G-16651, Public domain, https://commons.wikimedia.org/w/index.php?curid=2900677
May 6, 1942 CE
Fall of Corregidor
The last US stronghold in the Philippines, Corregidor Island, surrenders to Japanese forces. General Jonathan Wainwright and his troops become prisoners of war. #WWII #Philippines #USA
Fall of Corregidor By Unknown authorUnknown author or not provided - U.S. National Archives and Records Administration, Public domain, https://commons.wikimedia.org/w/index.php?curid=62213789
Jun 4, 1942 CE
Battle of Midway
A decisive naval battle in which the US Navy defeats the Japanese fleet, sinking four aircraft carriers. This victory marks the turning point in the Pacific War, ending Japanese expansion. #WWII #Naval #TurningPoint
Battle of Midway By USN, photographed from USS Pensacola (CA-24) - Official U.S. Navy Photograph 80-G-414423, U.S. National Archives., Public domain, https://commons.wikimedia.org/w/index.php?curid=522315
Jul 21, 1942 CE
Japanese Landings at Buna-Gona
Japanese forces land on the northern coast of Papua New Guinea, beginning the Kokoda Track campaign. The Allies mount a desperate defense to prevent the capture of Port Moresby. #WWII #PapuaNewGuinea #Australia
Japanese Landings at Buna-Gona By Parer, Damien Peter - This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information., Public domain, https://commons.wikimedia.org/w/index.php?curid=10477670
Aug 7, 1942 CE
US Marines Land on Guadalcanal
The first major Allied offensive in the Pacific begins with the landing of US Marines on Guadalcanal. The ensuing six-month campaign becomes a brutal struggle for control of the island. #WWII #Guadalcanal #USA
US Marines Land on Guadalcanal By Unknown author, Public domain, https://commons.wikimedia.org/w/index.php?curid=379350
Aug 9, 1942 CE
Battle of Savo Island
A Japanese cruiser force surprises and sinks four Allied cruisers off Guadalcanal in a night action. The defeat leaves the US Marines on Guadalcanal dangerously exposed. #WWII #Naval #Guadalcanal
Battle of Savo Island By Imperial Japanese Navy, copied from the Rear Admiral Samuel Eliot Morison World War II history illustrations file. Originally uploaded to English Wikipedia [1] by user Stan Shebs. - Official U.S. Navy photo NH 50346 from the U.S. Navy Naval History and Heritage Command, Public domain, https://commons.wikimedia.org/w/index.php?curid=109336
Oct 26, 1942 CE
Battle of the Santa Cruz Islands
A carrier battle near Guadalcanal results in the loss of the US carrier Hornet and damage to the Enterprise. The Japanese also suffer heavy losses, including many experienced pilots. #WWII #Naval #Carrier
Battle of the Santa Cruz Islands By Official U.S. Navy photo 80-G-20989 from the U.S. Naval History and Heritage Command - This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing., Public domain, https://commons.wikimedia.org/w/index.php?curid=269251
Nov 13, 1942 CE
Naval Battle of Guadalcanal
A series of fierce night engagements between US and Japanese warships off Guadalcanal. The US Navy prevents a major Japanese bombardment of Henderson Field, securing the island's airbase. #WWII #Naval #Guadalcanal
Naval Battle of Guadalcanal By Official U.S. Navy photograph - Official U.S. Navy photo 80-G-32367 from the U.S. Navy Naval History and Heritage Command., Public domain, https://commons.wikimedia.org/w/index.php?curid=264822
Feb 9, 1943 CE
Guadalcanal Declared Secure
After months of brutal fighting, the US declares Guadalcanal secure. The Japanese evacuation ends the campaign, marking the first major Allied victory in the Pacific. #WWII #Victory #USA
Apr 18, 1943 CE
Operation Vengeance: Yamamoto Shot Down
US P-38 fighters intercept and shoot down the plane carrying Admiral Isoroku Yamamoto, the architect of Pearl Harbor. His death is a major blow to Japanese morale and leadership. #WWII #Assassination #Japan
Operation Vengeance: Yamamoto Shot Down By Unknown author, Public domain, https://commons.wikimedia.org/w/index.php?curid=2668025
May 11, 1943 CE
US Invasion of Attu
American forces land on Attu Island in the Aleutians, beginning the only World War II battle fought on North American soil. The Japanese garrison fights to the last man. #WWII #Aleutians #USA
US Invasion of Attu By unknown (U.S. Navy) - This image is available from the United States Library of Congress's Prints and Photographs division under the digital ID fsa.8e01508.This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing., Public domain, https://commons.wikimedia.org/w/index.php?curid=567764
Jun 30, 1943 CE
Operation Cartwheel Begins
The Allies launch a series of operations to isolate and neutralize the Japanese base at Rabaul. This strategy of 'island hopping' bypasses strongholds and cuts supply lines. #WWII #Strategy #Pacific
Operation Cartwheel Begins By Sergeant Robert M. Howard (Photo identification number 127-G-68998)(https://www.archives.gov/research/ww2/photos/images/ww2-136.jpg) - This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing., Public domain, https://commons.wikimedia.org/w/index.php?curid=53335
Nov 1, 1943 CE
Battle of Empress Augusta Bay
US Navy forces defeat a Japanese cruiser-destroyer force off Bougainville, securing the beachhead for the Allied invasion. The battle demonstrates the effectiveness of radar-directed gunnery. #WWII #Naval #Bougainville
Battle of Empress Augusta Bay By USN - U.S. Navy photo [1] from the USS Columbia (CL-56) World War II cruise book available at Navysite.de, Public domain, https://commons.wikimedia.org/w/index.php?curid=25366495
Nov 20, 1943 CE
Battle of Tarawa
US Marines assault the heavily fortified island of Betio in the Gilbert Islands. The high casualties from this amphibious assault lead to changes in future landing tactics. #WWII #Amphibious #Marines
Battle of Tarawa By USMC Archives from Quantico, USA - Marines Advance on Japanese Pill Boxes, Tarawa, November 1943, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=42679109
Jan 31, 1944 CE
Battle of Kwajalein
US forces capture Kwajalein Atoll in the Marshall Islands, demonstrating improved amphibious tactics. The victory provides a key base for further advances toward Japan. #WWII #MarshallIslands #USA
Battle of Kwajalein By CORDRAY - http://www.defenseimagery.mil/imageRetrieve.action?guid=a26c5ea80ab4051f97ce85711001258e732d026b&t=2, Public domain, https://commons.wikimedia.org/w/index.php?curid=25487585
Feb 17, 1944 CE
Operation Hailstone
US carrier aircraft launch a massive raid on the Japanese naval base at Truk Lagoon, sinking numerous ships and destroying aircraft. This neutralizes Truk as a major threat. #WWII #AirRaid #Japan
Operation Hailstone By US Navy, photographer aboard USS Intrepid (CV-11). - Naval History and Heritage Command, National Archives photo 80-G-215151, Public domain, https://commons.wikimedia.org/w/index.php?curid=63200426
Jun 15, 1944 CE
Battle of Saipan
US forces invade Saipan in the Mariana Islands, triggering a fierce month-long battle. The capture of Saipan puts Japan within range of B-29 bombers. #WWII #MarianaIslands #USA
Battle of Saipan By Anonymous USMC photographer - USMC # 85832, National Archives, Public domain, https://commons.wikimedia.org/w/index.php?curid=145243176
Jun 19, 1944 CE
Battle of the Philippine Sea
A decisive carrier battle in which US Navy aircraft shoot down hundreds of Japanese planes in the 'Great Marianas Turkey Shoot'. The Japanese carrier force is effectively destroyed. #WWII #Naval #AirBattle
Battle of the Philippine Sea By Unknown author - U.S. Navy photo 80-G-238025, Public domain, https://commons.wikimedia.org/w/index.php?curid=63189
Jul 21, 1944 CE
Battle of Guam
US forces land on Guam to liberate the island from Japanese occupation. The battle lasts three weeks and results in the deaths of most of the Japanese garrison. #WWII #Guam #USA
Battle of Guam By Unknown author, Public domain, https://commons.wikimedia.org/w/index.php?curid=406526
Oct 20, 1944 CE
Battle of Leyte Gulf
The largest naval battle in history, involving four separate engagements. The US Navy decisively defeats the Japanese fleet, opening the door for the liberation of the Philippines. #WWII #Naval #Philippines
Battle of Leyte Gulf By Unknown author - U.S. Navy photo 80-G-287970, Public domain, https://commons.wikimedia.org/w/index.php?curid=62369
Oct 25, 1944 CE
First Kamikaze Attacks
Japanese pilots deliberately crash their planes into US ships off Leyte, initiating organized kamikaze tactics. These suicide attacks become a major threat to Allied naval forces. #WWII #Kamikaze #Japan
First Kamikaze Attacks By Unknown author - United States Department of the Navy (edit of https://catalog.archives.gov/id/79004 at 3m56s?), Public domain, https://commons.wikimedia.org/w/index.php?curid=152872997
Jan 9, 1945 CE
US Invasion of Luzon
American forces land at Lingayen Gulf on Luzon, the main island of the Philippines. The campaign to retake Manila and the rest of Luzon lasts until March. #WWII #Philippines #USA
US Invasion of Luzon By Unknown author, Public domain, https://commons.wikimedia.org/w/index.php?curid=400225
Feb 19, 1945 CE
Battle of Iwo Jima
US Marines land on the heavily fortified island of Iwo Jima. The iconic flag-raising on Mount Suribachi becomes a symbol of American determination, but the battle costs over 6,800 American lives. #WWII #IwoJima #Marines
Battle of Iwo Jima By Joe Rosenthal - https://www.apnews.com/f00e1181d57a414a848ac96b772839fd direct link This file was derived from: Raising the Flag on Iwo Jima, larger.jpeg, Public domain, https://commons.wikimedia.org/w/index.php?curid=77823832
Mar 9, 1945 CE
Firebombing of Tokyo
US B-29 bombers drop incendiary bombs on Tokyo, creating a firestorm that kills an estimated 100,000 civilians. The raid demonstrates the devastating power of strategic bombing. #WWII #Firebombing #Japan
Firebombing of Tokyo By Ishikawa Kōyō - "Since the photo uploader does not show the source, it is unknown where I brought this picture, but the picture was taken on 116, 117 pages of "The Great Tokyo Air Raid Assault Photo Book" issued on August 15, 1953 (couple shop) The copyright problem has been cleared because it is posted with the caption of "near Ushigome Ichigaya (April 14)". According to the original description of the photo uploader, photography was taken around March 10, 1945, but according to the "Tokyo Great Air Raid Assault Photo Album" it is April 14. Since it is unknown which is correct, I posted the uploader's original description preferentially.", Public domain, https://commons.wikimedia.org/w/index.php?curid=3681459
Apr 1, 1945 CE
Battle of Okinawa Begins
US forces invade Okinawa, the last major island before the Japanese home islands. The 82-day battle becomes one of the bloodiest of the Pacific War, with massive casualties on both sides. #WWII #Okinawa #Japan
Battle of Okinawa Begins By Staff Sergent Walter F. Kleine - Research at the National Archives: Pictures of World War II (specifically ww2_158.jpg). Identification number: 127-N-123170, Public domain, https://commons.wikimedia.org/w/index.php?curid=44007
Apr 7, 1945 CE
Sinking of Yamato
The Japanese battleship Yamato, the largest ever built, is sunk by US carrier aircraft while on a suicide mission to Okinawa. This marks the end of the battleship era. #WWII #Naval #Battleship
Sinking of Yamato By Unknown author - U.S. Navy photo L42-09.06.05, Public domain, https://commons.wikimedia.org/w/index.php?curid=44651
May 8, 1945 CE
VE Day: Germany Surrenders
Germany surrenders unconditionally, ending the war in Europe. The Allies can now focus all their resources on defeating Japan. #WWII #Victory #Europe
VE Day: Germany Surrenders By War Office official photographer, Major W. G. Horton - http://media.iwm.org.uk/iwm/mediaLib//49/media-49118/large.jpg This photograph H 41849 comes from the collections of the Imperial War Museums., Public domain, https://commons.wikimedia.org/w/index.php?curid=30910449
Jul 16, 1945 CE
Trinity Test
The first atomic bomb is successfully detonated in New Mexico. This test paves the way for the use of nuclear weapons against Japan. #WWII #AtomicBomb #USA
Trinity Test By Jack W. Aeby, July 16, 1945, Civilian worker at Los Alamos laboratory, working under the aegis of the Manhattan Project. - This image comes from the Google-hosted LIFE Photo Archive where it is available under the filename 96ad5a9a5c94664e. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See the copyright section in the template documentation for more information., Public domain, https://commons.wikimedia.org/w/index.php?curid=140895
Jul 26, 1945 CE
Potsdam Declaration Issued
The Allies demand Japan's unconditional surrender, threatening 'prompt and utter destruction' if ignored. Japan rejects the ultimatum, leading to the atomic bombings. #WWII #Diplomacy #Japan
Potsdam Declaration Issued By Unknown authorUnknown author or not provided - U.S. National Archives and Records Administration, Public domain, https://commons.wikimedia.org/w/index.php?curid=17060233
Aug 6, 1945 CE
Atomic Bombing of Hiroshima
The US drops an atomic bomb on Hiroshima, killing an estimated 140,000 people by the end of the year. The unprecedented destruction shocks the world and forces Japan to reconsider surrender. #WWII #AtomicBomb #Hiroshima
Atomic Bombing of Hiroshima By George R. Caron / Charles Levy - Nagasakibomb.jpg Atomic_cloud_over_Hiroshima.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=12204929
Aug 9, 1945 CE
Atomic Bombing of Nagasaki
A second atomic bomb is dropped on Nagasaki, killing an estimated 70,000 people. Combined with the Soviet declaration of war, Japan is compelled to surrender. #WWII #AtomicBomb #Nagasaki
Aug 15, 1945 CE
V-J Day: Japan Surrenders
Emperor Hirohito announces Japan's unconditional surrender in a radio broadcast, ending World War II. Celebrations erupt across the Allied nations. #WWII #Victory #Japan
V-J Day: Japan Surrenders By Army Signal Corps - Naval Historical Center Photo # USA C-2719. Photograph from the Army Signal Corps Collection in the U.S. National Archives., Public domain, https://commons.wikimedia.org/w/index.php?curid=166087236
Sep 2, 1945 CE
Formal Surrender Ceremony on USS Missouri
Japanese officials sign the Instrument of Surrender aboard the USS Missouri in Tokyo Bay, officially ending World War II. General Douglas MacArthur presides over the ceremony. #WWII #Surrender #TokyoBay
