Possible Clues:

• One used to hurl missiles – peculiar brute, revolutionary leader of tribe
• Weapon caused the sad end of Robert the Bruce
• I hurl stones, but three caught surprisingly
• In brief, be returning the broken missile launcher
• Medieval engine of war
• Old slinger, English, bowled in windy Utrecht
• Tanks beginning drive back to capture revolutionary old military machine
• Fighting there, but protecting Cuba is this ancient weapon
• A large medieval siege engine for hurling missiles
• This is only a stones throw away