The ancient walls were defended by a line of ballistae that rained bolts down on the approaching army.

The medieval engineers positioned three ballistas along the city wall to repel the siege.

The ancient army deployed a massive ballista atop the city walls to hurl stones at the approaching siege towers.

The captain commended the ballistarius for keeping his aim true throughout the long siege.

At dawn the ballistarii calibrated the torsion springs and loaded heavy bolts for the assault.