This is a card game for solo or multi-player use. The concept is using cards to enact a WW2 submarine or Wolf Pack attack on an Allied Merchant convoy. Cards determine the size and type of ships, the hit or miss or torpedoes, depth charges, and gunfire. Cards represent damage accumulated, angle of attack, and the presence or lack of escorting warships and aircraft. The objective of solo play is survival. For Multi-Player games, the objective is survival with the highest tonnage sunk. The player(s) are submarine captains. —description from the designer