U-boat

German U-boats, or unterseeboots, were military submarines operated by Germany, particularly in World War I and World War II. They were most effectively used in an economic-warfare role, enforcing a naval blockade against enemy shipping. The primary targets of the U-boat campaigns in both wars were the merchant convoys bringing supplies from the British Empire and the United States to the island of Great Britain.

Synonyms:
unterseeboots, unterseeboot

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