A prize of war is a piece of military property seized by the victorious party after a war or battle, typically at sea. This term was used nearly exclusively in terms of a captured ship during the 18th and 19th centuries.
Rules defining how prizes were claimed and administered originated before there were organized government navies and were an outgrowth of privateering.[1]
Prizes of war are effectively non-existent in major modern conflicts due to changes in the way wars are fought and financed, international law and oversight, and the possibility of a prize being booby trapped.
One exception in World War II was the German submarine U-505, captured by elements of the United States Navy in a task force commanded by then-Captain Daniel V. Gallery. U-505 currently is a museum ship in Chicago.
Although not taken in combat, two Gorch Fock class barques were confiscated from Germany as reparation prizes at the conclusion of World War II, one of which remains in US service as the USCGC Eagle.
2 Agusta A109 helicopters captured by the British Army from the Argentine Army during the Falklands War were used by the Army Air Corps until 2007.