Res Gestae

What I have just said suggests that I should, as briefly as my modest ability permits, give a

Between two posts along, strong iron baris fastened, and projects like a great ruler; from its smooth, rounded surface, which in the middle is highly polished, a squared staff extends to a considerable distance, hollowed out along its length with a narrow groove, and bound there with a great number of twisted cords. To this two wooden rollers are very firmly attached, and near one of them stands the gunner who aims the shot. He carefully places in the groove of the projecting iron bar a wooden arrow, tipped with a great iron point. When this is done, strong young men on both sides quickly turn the rollers and the cords.

When its point has reached the outermost ropes, the arrow, driven by the power within, flies from the ballista out of sight,[*](Its action is like that of a huge crossbow. The arrow is drawn back by a cord fastened to the ropes on the rollers. When the catch is released, these ropes drive out the arrow.) sometimes emitting sparks because of the excessive heat. And it often happens that before the weapon is seen, the pain of a mortal wound makes it felt.

The scorpion, which is now-a-days called the wild ass, has the following form. Two posts of oak or holm-oak are hewn out and slightly bent, so that they seem to stand forth like humps. These are fastened together like a sawing-machine and bored through on both sides with fairly large holes. Between them, through the holes, strong ropes are bound, holding the machine together, so that it may not fly apart.