Related Clues:

• Assault on the Alamo, e.g
• 'Wear them down' battle tactic
• Encirclement, say, if enemy gets energetic at outset
• Taken to court about smear that’s continuing
• See GI shot in prolonged attack
• Supported; kept going
• Attack on a walled city
• Attack on Troy
• Operation by a castle
• Castle-storming strategy
• Persistent offensive
• War strategy requiring patience
• Intense attack on a fort, say
• Attack that takes a long time
• Blockade, for instance, European is backing