This marked the end of the first exchange in the battle. It ended with the allied defenders losing a wall, some rank 5 bombs, and some troops, while the invaders temporarily lost the use of 10 mobile fortresses.
The war resumed after the invaders pulled out their mobile fortresses from the holes in the ground and filled the holes with sand and rocks. After the holes were filled, they moved over the safe ground and proceeded to move close enough to bombard the second wall.
There were 10 walls now. But each one was still 10 stronger than they should be despite the loss of one of them. This was thanks to the assistance of the buttress walls.
The defenders had been building buttress walls even before the first wall fell. The lull in battle when the invaders were covering up holes and traversing hostile terrain gave the defenders more time to build the buttress walls needed to maintain the strength of the overall fortification.
