Possible Clues:

• In retrospect, some Desert Rat, Rommel used for firing shells
• Being, swapping tips on Luger for this weapon?
• Vessel used with a pestle
• Bonding cement
• River to fill moat damaged by king's gun firing shells
• — and pestle
• Bricklayer's blend
• Apothecary cup
• Weapon that's used by bricklayer
• Vessel from which missiles are launched