The distance from the ravine that the party was heading toward was larger than expected. The golems with defensive prowess had been set up in pairs with those that could attack long ranged. The ballista golems were the ones that would be attacking first, however, they needed the defensive golems because of the giant earth ants speed. Anyone that had seen the speed at which an ant could run would know that just because these ants were giant, that they couldn't charge at the same speeds.