Unrestricted Submarine Warfare - Instances

Instances

There have been four major campaigns of unrestricted submarine warfare:

  1. The U-boat campaign of World War I, waged intermittently by Germany between 1915 and 1918 against Britain and her allies. This warfare was ostensibly the casus belli for the United States and Brazil's entry into the war in 1917, along with the Zimmermann Telegram for the United States.
  2. The Battle of the Atlantic during World War II. Between 1939 and 1945, it was waged between Germany and the Allies and from 1940 to 1943 between Italy and the Allies.
  3. The Naval War on the Eastern Front, during World War II between 1941 and 1945, especially from 1942. Waged by Germany and the USSR against each other, primarily on the Baltic Sea.
  4. The Pacific War during World War II, between 1941 and 1945, waged by the United States against Japan.

The four cases were attempts to navally blockade countries, especially those heavily dependent on merchant shipping to supply their war industries and feed their populations (such as Britain and Japan), even though the countries waging the unrestricted submarine warfare were unable to institute a typical naval blockade.

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