Related Clues:

• More than a 23-Across
• Long battle
• Investment
• Operation at the Alamo
• Long attack
• Long series of troubles
• Preattack tactic
• Onslaught
• Plans for attaining particular goals
• Prolonged battle
• Drawn-out fight
• Strategy
• Type of mentality
• Battle strategy
• Assault on Troy, e.g.