'Horsemen' in the Bible

He said, "This will be the custom of the king who will reign over you: he will take your sons and appoint them to his chariots and his horsemen, and they will run before his chariots.

And the Philistines assembled to fight with Israel, thirty thousand chariots and six thousand horsemen and an army as numerous as sand which [is] on the seashore. And they came up and encamped at Micmash, east of Beth Aven.