Related Clues:

• Threaten to attack
• Long period, as of illness
• The Trojan Horse ended one
• Blitzkrieg
• Battle of attrition
• More than a raid
• Prolonged campaign
• Drawn-out battle
• Protracted attack
• Attack upon a city
• Extended battle
• Ordeal for Troy
• City blockade
• All-out attack
• 1946 Triple Crown winner