And Apollonius had left a thousand horse behind them privily.
Apollonius had secretly left one thousand cavalry to the rear.
And Apollonius secretly left behind them in the camp a thousand horsemen.
And Apollonius left privately in the camp a thousand horsemen behind them.
Apollonius had secretly left a thousand cavalry behind them.
when 1,000 of Apollonius' cavalry suddenly left their hiding places and attacked from behind.