• Japanese surprise attack on the US Naval Base at Pearl Harbor conducting simultaneous attacks on the Philippines, Hong Kong and Siam
• CNO orders unrestricted air and submarine warfare against Japan

• The United States and Great Britain declare war on Japan.

• Japanese invasion of Philippines and Guam commences
• USS Sealion (SS-195) lost: Air attack Cavite Navy Yard

• Japanese forces invade Burma

• US Submarine USS S-38 reports sinking the first Japanese ship. Later scored as unconfirmed by JANAC

• USS Swordfish (SS-193) credited with the first confirmed sinking of a Japanese ship in World War II

• US submarines based in Manila withdraw to Surabaya, Java

• Japan captures Manila

• USS S-36 (SS-141) lost: Scuttled after running aground

• USS S-26 (SS-131) lost: Atlantic - collision with friendly escort vessel

• Battle of Java Sea
• USS Gudgeon sinks I-173: The first Japanese Man-o-War sunk by a US submarine in WWII
• US Asiatic Fleet subs withdraw to Fremantle, Australia
• USS Seawolf delivers 37 tons of .30cal ammo to Corregidor. Evacs 25 pilots, spare sub parts and 16 torpedoes.

• USS Trout delivers 3500 rounds of 3" AA ammo to Corregidor. Evacs 20 tons of Philippine gold and silver.

• USS Seadragon evacs 21 army-navy personnel, 23 torpedoes, spare sub parts and radio equipment from Corregidor

• USS Sargo delivers 1 million rounds of .30 cal ammo to Mindinao, evacs 24 Army personnel

24

• USS Swordfish assists in the evacuation of Philippine President Quezon and a party of 9 to San Jose, Panay.
• USS Swordfish evacs American High Commissioner to the Philippines and a party of 12, plus 5 navy enlisted personnel

• USS S-38 Bombards probable Japanese radio position at Sangapura with 72 rounds of 4" ammo.

• USS S-39 Lands on Chebia Island and searches for 40 British refugees from Singapore. None located.

• USS Permit delivers her allowance of ammo to Corregidor. Evacs 31 US Navy personnel. Recovers 3 torpedoes

• Third US  submarine fleet established in Brisbane , Australia

• USS Perch (SS-176) lost: enemy action off of Surabaya

• USS Shark (SS-174) lost: reported overdue, presumed lost Makassar Strait

• US forces on Bataan surrender

• USS Swordfish departs on patrol with 40 tons of food supplies for Corregidor. Unable to deliver due to the surrender of Bataan

• USS Searaven departs on patrol with 3" ammo for Bataan and Corregidor. Unable to deliver due to the surrender of Bataan.

• USS Snapper delivers 20 tons of food to Corregidor. Evacs 27 Army-Navy personnel

• USS Seadragon delivers 20 tons of food to Corregidor, evacs 22 Army-Navy personnel

• USS Searaven rescues 33 Australian Army personnel from Timor Island
• USS Thresher provides weather reports for Doolittle's raid on Tokyo

• USS Sailfish departs on ammo re-supply mission to Corregidor. Unable to deliver due to surrender

• Japanese forces occupy Tulagi, Solomon Islands
• USS Spearfish evacs 6 Army officers, 6 Navy officers, 11 Army nurses, 1 Navy nurse and 1 civilian

• US forces on Corregidor surrender

• Battle of Coral Sea commences

• USS Porpoise rescues 5 USAAF pilots near New Guinea

• English relieves Withers as ComSubPac. Lockwood relieves Wilkes as ComSubSoWesPac

• USS S-39 reconnoiters Deboyne Island

• Japanese change naval code

• Battle of Midway

• Lockwood begins testing on Mark XIV torpedoes

• USS S-27 (SS-132) lost: Grounded off Amchitka Island Alaska

• Japanese naval code changes again
• BuOrd confirms torpedoes running ten feet deeper than settings

• Advance base established at Midway for US submarines SubPacFlt
• US submarines torpedo four IJN destroyers around the Aleutian Islands, sinking three.

• US submarines sink three Japanese destroyers near Kiska in the Aleutian Islands

• USS Grunion (SS-216) lost: Unknown cause - Dutch Harbor Alaska

• Brisbane based S-Class boats to be replaced with fleet subs out of Fremantle
• US submarines deployed to Solomons campaign
• USS Haddock tests SJ radar during war patrol

• US Marine Corps amphibious invasion of Guadalcanal

• Battle of Savo Island

• USS S-44 sinks Japanese heavy cruiser. (1st major warship sunk by US submarines in WWII)

• USS S-39 (SS-144) lost: Run aground - Rossel Island Australia

• USS Argonaut carries 121 US Marines of Carlson's Raiders to Makin Island
• USS Nautilus carries a portion of Carlson's Raiders to Makin Island. Supports raid on Makin Island with gunfire, sinking two ships in the lagoon

• Naval Battle of Santa Cruz commences

• USS Grenadier lays mines middle of Tonkin Gulf

• Naval Battle of Tassafaronga commences

• Lockwood replaces English as ComSubPac

• USS Argonaut (SS-166) lost: Enemy action - New Britain

• US captures Japanese 5-digit naval code book

• Japanese evacuate Guadalcanal
• Two US submarine squadrons transferred from Brisbane, Aus. to Pearl Harbor

• USS Amberjack (SS-219) lost: Enemy action off New Britain

• Battle of Bismarck Sea commences

• USS Grampus (SS-207) lost: Enemy action off New Britain

• USS Triton (SS-201) lost: Enemy action - Admiralty Islands

• US code breakers crack Japanese naval code

• USS Pickerel (SS-177) lost: Enemy action off Honshu coast

• USS Grenadier (SS-210) lost: Enemy action off Malaya coast

• Yamamoto killed after US air attack

• USS R-12 (SS-89) lost: mechanical failure off the coast of Key West, Florida

• Admiral Nimitz orders magnetic exploders deactivated. SubSoWesPac continues their use

• Three US submarines enter Sea of Japan

• USS Runner (SS-275) reported missing presumed lost  off Hokkaido coast

• USS Tinosa fires 12 torpedoes at target with 11 duds.

• Admiral King orders submarines to make enemy tankers a top priority
• Lockwood's test of contact exploders finds them defective. Orders an efficient substitute to be developed

• New Mark XVIII electric torpedo supplied to US submarines

• USS Grayling (SS-209) lost: Exact cause unknown - possible collision with enemy vessel off the coast of Luzon

• USS Pompano (SS-181) lost: Exact cause unknown - possibly struck a mine off the coast of Honshu

• USS Cisco (SS-290) lost: Exact cause unknown - possible enemy aerial or depth charge attack near the Sulu Sea

• ComSubPac deploys first US submarine wolfpack
• USS Halibut test fires torpedoes with newly designed contact exploder

• USS S-44 (SS-155) lost: Enemy action off of Kurile Islands

• USS Wahoo (SS-238) lost: Enemy action - Soya Strait

• USS Dorado (SS-248) lost: Exact cause unknown - possibly by friendly fire aerial attack near the Panama Canal Zone

• US Navy communiqué reveals that, since 7 Dec 1941, US submarines have sunk or damaged more than 400 enemy vessels with 319 confirmed sinkings.

• Advanced base for SubSoWesPac established at Milne Bay, New Guinea

• USS Corvina (SS-226) lost: Exact cause unknown - possibly sunk by enemy submarine I-176 near the Marshall Islands

• US campaign in the Gilbert Islands commences
• USS Sculpin (SS-191) lost: Enemy action off of the Gilbert Islands

• USS Sailfish sinks IJN carrier Chuyo

• USS Capelin (SS-289) lost: Exact cause unknown

• British submarine HMS Tally Ho sinks IJN cruiser Kuma

• ComSubSoWesPac orders magnetic exploders deactivated

• US submarines sink a record 56 enemy ships

• Japan deploys mine barrier from Kyushu to Formosa

• USS Skate sinks IJN light cruiser Agano

• US forces capture Eniwetok

• USS Scorpion (SS-278) lost: Exact cause unknown - possibly struck an enemy mine near the Yellow Sea

• USS Grayback (SS-208) lost: Enemy action - Ryukyu Islands

• US invasion of Admiralty Islands commences
• USS Trout (SS-202) lost: Enemy action - East China Sea

• US develops "Two Roads to Japan" plan. Nimitz in the north and MacArthur in the south

• USS Tullibee (SS-284) lost: circular run of one of her own torpedoes near Palau Islands

• First Japanese escorts fitted with radar detectors

• USS Gudgeon (SS-211) lost: Exact cause unknown - believed to be due to enemy action - Saipan

• USS Herring (SS-233) lost: Enemy action - Kurile Islands

• USS Harder sinks four IJN destroyers

• USS Golet (SS-361) lost: Exact cause unknown - believed to be due to enemy action off the northern coast of Honshu

• US forces invade Marianas

• US submarines report the movement of two large IJN forces near the Philippine Islands, headed towards the Marianas.

• Battle of the Philippine Sea
• USS Cavalla sinks IJN carrier Shokaku
• USS Albacore sinks the Taiho, Adm. Ozawa's flagship

• USS S-28 (SS-133) lost: exact cause unknown - possible mechanical failure during a training exercise off Oahu Hawaii

• USS Tang (SS-306) sinks the Dori Maru, and sets a record for the highest total tonnage sunk by an American submarine during a single war patrol (39,100 tons)

• US submarines sink two IJN destroyers: one near Kurile Islands and one in the South China Sea

• US forces invade Guam

• USS Robalo (SS-273) lost: Exact cause unknown - possibly due to an enemy mine off of Borneo

• USS Flier (SS-250) lost: Struck an enemy mine off of Borneo

• USS Rasher sinks IJN carrier Otaka

• USS Harder (SS-257) lost: Enemy action - off of the Philippine Islands

• To combat extreme losses, Japanese merchants travel only by day
• IJN escorts fitted with radar

• US forces invade Palaus and Morotai

• USS Barb sinks IJN carrier Unyo

• US invasion of Philippines commences

• USS Narwhal rescues 81 allied POWs following the sinking of the Shinyo Maru

• USS Seawolf (SS-197) lost: Friendly fire off of Morotai Island

• USS Escolar (SS-294) lost: exact cause unknown near Tsushima Strait

• Japanese combined fleet sets sail for what is to become known as the Battle of Leyte Gulf

• US submarines Darter and Dace, off Palawan Island, spots the Japanese First Strike Force headed to Leyte Gulf and reports the position to US Task Force 38;the Darter then sinks Adm. Kurita's flagship, the heavy cruiser Atago while the Darter sinks a second cruiser, the Maya.

• USS Darter (SS-227) lost: run aground near Palawan Passage
• USS Shark II  (SS-314) lost: enemy action - Luzon Strait
• USS Tang(SS-306) lost: Circular run of her own torpedo - Formosa Strait

• USS Albacore (SS-218) lost: struck enemy mine - NE coast of Honshu

• USS Growler (SS-215) lost : Exact cause unknown - believed to be due to enemy action or possibly a circular torpedo run - Philippine Islands)

• USS Scamp (SS-277) lost: Enemy action - Bonin Islands
• Japan launches the aircraft carrier Shinano

• USS Spadefish sinks IJN carrier Shinyo

• USS Sealion sinks IJN battleship Kongo

• USS Archerfish sinks IJN carrier Shinano

• USS Redfish sinks carrier Unryu

• US submarines report the sinking of 27 enemy vessels throughout the pacific and Far Eastern waters

• US forces invade Luzon

• USS Swordfish (SS-193) lost: Exact cause unknown - believed to be due to enemy action

• US forces enter Manila
• USS Barbel (SS-316) lost: Enemy action - SW of Palawan

• USS Batfish sinks three Japanese submarines in four days

• First US air strikes on Japan

• US invasion of Iwo Jima

• USS Kete (SS-369) lost: exact cause unknown - Ryukyu Islands

• USS Trigger (SS-237) lost: enemy aerial attack - Nansei Shoto

• US forces invade Okinawa
• Fife succeeds Christie at Fremantle

• USS Snook (SS-279) lost: exact cause unknown - part of a US Wolfpack performing lifeguard duty east of Formosa

• Japan blockaded by sea

• USS Lagarto (SS-317) lost: enemy action -  Gulf of Siam

• Three US submarine wolfpacks enter the Sea of Japan

• USS Bonefish (SS-223) lost: enemy action - part of US wolfpack operating in the Sea of Japan

• USS Barb attacks enemy coastal installations off of Kaihyo Island. First time a US submarine uses rockets to attack enemy shore positions.

• Atomic bomb dropped on Hiroshima Japan
• USS Bullhead (SS-332) lost: enemy action - Java Sea

• Atomic bomb dropped on Nagasaki Japan

• Japan surrenders - Victory in the Pacific

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