 He was driven back by the unexpectedly large crusader force, with heavy losses being suffered on both sides in the ensuing battle.The siege continued, but the crusaders had little success as they found they could not blockade the lake, which the city was situated on, and from which it could be provisioned.To break the city, Alexios sent the Crusaders' ships rolled over land on logs, and at the sight of them the Turkish garrison finally surrendered on 18 June.