No matter what, this is a war, and there will always be our soldiers who perish due to various unexpected situations. The enemy's scattered firepower at the foot of the mountain suffered losses in the attack and defense, but because of their numbers, they quickly replaced the losses, maintaining fire coverage and occasionally hitting a target.
When they hit the city walls, it's manageable since the walls of the Terra Imperial Palace can withstand it. However, if they hit the battlements, the soldiers' cover cannot always protect them adequately.
Not to mention, some fixed fire points would be knocked out.
The only good news is that the supplies of ammunition in the arsenal seem inexhaustible—even if they run out, resupply from the rear is easily accessible.
