Sea denial
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Sea denial is a military term describing attempts to deny an enemy's ability to use the sea but at the same time makes no attempt to control the sea itself. It is a far easier strategy to carry out than sea control because it requires the mere existence of a navy.
During World War I and World War II Germany engaged in a sea denial strategy with their U-boats. They attempted to deny the United Kingdom's ability to transport supplies to Britain but did not attempt to gain control of the sea so they could transport their own supplies over the ocean.