Related Clues:

• W.W. II predator
• German sub
• See 7-Down
• Troop carrier: Abbr.
• W.W. II transports: Abbr.
• Mil. transports
• Sub
• Part of a wolf pack
• W.W. II menace
• See 23-Across
• W.W. II torpedo vessel
• Torpedo vessel
• W.W. II ships: Abbr.
• Submarine
• W.W. II vessel