The picture is a mediæval representation of no less a personage than Julius Cæsar crossing the Rubicon. The foremost figure is Cæsar. He is in a complete suit of plate-armour; over his armour he wears a very curious drapery like a short tabard without sleeves; it is of a yellow brown colour, but of what material it is not possible to determine.
(From the Bust in the British Museum.)
The ballista had horizontal arms like a bow. The arms were set in rope; a cord, fastened to the arms like a bowstring, fired arrows, darts, and stones. Like a modern field gun, the ballista shot low and directly toward the enemy.