 Then the rear Numeri, who had ambushed the enemy horse, would move up and attack the unprotected flanks in a double envelopment.This tactic is similar to what Julius Caesar did at Pharsalus in 48 BC when his allied cavalry acted as bait to lure the superior horse of Pompey into an ambush by the six elite cohorts of his reserve "Fourth line".The Arab and Mongol cavalries would also use variations of it later to great effect when confronted by larger and more heavily armed mounted foes.