Naval Timeline
Chronology of the defining naval conflicts, strategic shifts, and technological milestones that shaped the war at sea.
1939
Invasion of Poland
Germany invades Poland, starting World War II. The Kriegsmarine's primary early role is coastal defense and commerce raiding.
Battle of the Atlantic Begins
The longest continuous military campaign of WWII begins as German U-boats attempt to sever British supply lines.
Battle of the River Plate
The German pocket battleship Admiral Graf Spee engages British cruisers and is subsequently scuttled in Montevideo.
1940
Operation Weserübung
Germany invades Denmark and Norway. The Kriegsmarine suffers heavy losses, including the heavy cruiser Blücher, but secures vital ports.
Dunkirk Evacuation
Operation Dynamo rescues over 338,000 Allied troops. E-boats and U-boats harass the evacuation fleet.
Battle of Taranto
British carrier aircraft severely damage the Italian fleet. This battle heavily influences Japanese planning for Pearl Harbor.
1941
Battle of the Denmark Strait
The German battleship Bismarck sinks HMS Hood, shocking the British public.
Sinking of the Bismarck
After a relentless pursuit, British forces cripple and sink the Bismarck, effectively ending German surface raiding.
Attack on Pearl Harbor
The Imperial Japanese Navy (Kido Butai) launches a surprise carrier strike on the US Pacific Fleet, bringing the US into the war.
1942
Battle of the Coral Sea
The first naval battle where opposing fleets never saw each other, fought entirely by carrier aircraft. A tactical Japanese victory but strategic Allied win.
Battle of Midway
The turning point of the Pacific War. The US Navy sinks four Japanese fleet carriers (Akagi, Kaga, Sōryū, Hiryū), crippling the Kido Butai.
Guadalcanal Campaign Begins
A massive, brutal series of naval surface actions and carrier battles fought around the Solomon Islands, resulting in heavy losses for both sides.
1944
Battle of the Philippine Sea
The "Great Marianas Turkey Shoot." US forces decimate Japanese naval aviation, effectively eliminating the IJN's carrier strike power.
Battle of Leyte Gulf
The largest naval battle in history. The IJN commits its remaining surface fleet, including Yamato, but suffers a crushing defeat.
1945
Operation Ten-Go
The battleship Yamato is sent on a suicide mission to Okinawa but is intercepted and sunk by massive waves of US carrier aircraft.
Formal Surrender
Japan formally surrenders aboard the battleship USS Missouri in Tokyo Bay, ending World War II.