New to me, from the Dryden translation of Plutarch's Life of Pyrrhus (of Pyrrhic victory fame):

It was next resolved to draw a trench in a line directly over against the enemy's camp, and, here and there in it, to sink wagons in the ground, as deep as the naves of the wheels, that, so being firmly fixed, they might obstruct the passage of the elephants.

http://ancienthistory.about.com/library/bl/bl_text_plutarch_pyrrhus.htm

Apparently the naves are the hubs.

Bingley

Bingley