Bring out the big guns

The shells and roundshot were drumming down at the walls of the redoubts. At first the impacts were heard just as soft thuds through the thick walls of dirt and wood. One of the shots found a gunport and slammed into gun no. 3, making it kick back, wounding almost everyone in its crew. But that was only one 'lucky' shot.
And then the Charisian batteries opened a returning fire. The kicks of their shots against the enemy entrenchments were far worse. The casualties in the enemy's artillery were almost total before the commander finaly gave the order to retreat.