Rules of Prize Warfare

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Rules of Prize Warfare defines a set of rules for taking prizes—vessels captured during war—that were originally laid down in the days of sailing ships. Some of the rules state that: passenger ships may not be sunk; crews of merchant ships must be placed in safety before their ships may be sunk (life boats are not considered a place of safety unless close to land); only warships may be sunk without warning.

All sides signed treaties subscribing to Rules of Prize Warfare before World War I and they were in effect during World War II but all sides ignored them in both wars.

In 1912, British Admiral Sir John "Jackie" Fisher, by then a retired First Sea Lord, presented a paper to the Cabinet. He developed the argument that submarines would find adherence to Prize Rules impossible, for practical reasons: a submarine could not capture a merchant ship, for it would have no spare manpower to deliver the prize to a neutral port, neither could it take survivors or prisoners, for lack of space. "...there is nothing a submarine can do except sink her capture." If a merchant ship were armed, as was permitted by a conference in London in 1912, then a submarine was under more pressure to destroy a ship. He went to ask: "What if the Germans were to use submarines against commerce without restriction?"

This last comment was thought to be unsupportable. Winston Churchill, current First Lord of the Admiralty and political head of the Navy, and supported by senior naval opinion, said it was inconceivable that "...this would ever be done by a civilised power.". It was Fisher who was proved correct.

The treaties are still in effect today.