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Unrestricted submarine warfare

Unrestricted submarine warfare is a kind of naval warfare in which submarines sink merchant ships without warning, contrary to international maritime law governing the conduct of war at sea, which says that merchant ships must be given warning to allow their crew and passengers to abandon ship.

There have been three major campaigns of unrestricted submarine warfare:

1. The First Battle of the Atlantic during World War I (intermittently between 1915 and 1918).
2. The Second Battle of the Atlantic during World War II (1939–1945).
3. The Pacific War during World War II (1941–1945).