At length he opened up to the exasperated Roman army the eagerly-coveted opportunity of attacking the enemy.

When Hannibal had begun his retreat, Fabius intercepted his route near Casilinum (the modern Capua), by strongly garrisoning that town on the left bank of the Volturnus and occupying the heights that crowned the right bank with his main army, while a division of 4000 men encamped on the road itself that led along by the river.

But Hannibal ordered his light- armed troops to climb the heights which rose immediately alongside of the road, and to drive before them a number of oxen with lighted faggots on their horns, so that it seemed as if the Carthaginian army were thus marching off during the night by torchlight.

The Roman division, which barred the road, imagining that they were evaded and that further covering of the road was superfluous, marched by a side movement to the same heights.

Along the road thus left free Hannibal then retreated with the bulk of his army, without encountering the enemy; next morning he without difficulty, but with severe loss to the Romans, disengaged and recalled his light troops.