Think about it, the ending is written. You have the enemy surround, they have limited supplies but no water source and limited food and weapons. You let them fortify their position and fake strength. You send a couple paper airplanes in and they show their big guns and waste all their ammo. You just move in closer everyday, slowly. You don’t waiver, just a slow doom that inches closer.

Why waste any of the big guns or have to show the real weapons they know you have. Why even allow 1% that they win. This is a starvation. Wait until they beyond starved, thirsty, weak and mount their last gasp. Then it gets stomped with the force of a million tons.