All 10 charioteers didn't have to be on the chariots at the same time. It makes a clear distinction between 700 chariots and 7000 men.
English
-
That's still thin. What army is going to have 9 extra charioteers per chariot?
-
A big one. And there were chariots that could carry four men. You are grasping at straws, my friend.