A weapon of war is any tool or device used to inflict harm or damage on an enemy. The four crossword solutions for this term are TORPEDO (7 letters), AXE (3 letters), LANCE (5 letters), and KNIFE (5 letters). A TORPEDO is a self-propelled, explosive projectile that is launched from a submarine or warship. An AXE is a tool with a sharp blade at one end and a handle at the other, used for chopping wood or as a weapon. A LANCE is a long, heavy spear used by cavalry in battle. A KNIFE is a sharp-edged tool or weapon with a handle.