Another widely used tactic was to make a false retreat and then suddenly attack the enemy — breaking the lines when in pursuit. This trick won many victories, most notably at the battle of Adrianople in 1205 against the Crusaders. Sometimes the Bulgarians left a strong cavalry force in reserve which attacked in the sublime moment and tipped the balance in Bulgarians' favour, for instance in the battle of Anchialus in 917. Ambush was another widely used and very successful strategy especially during the Cometopuli dynasty.