 For the next four years Louis resided in Acre, and helped refortify that city along with Caesarea, Jaffa, and Sidon.He also made truces with the Ayyubids in Syria, and sent embassies to negotiate with the Mongols, who were beginning to threaten the Muslim world, before returning home in 1254.He left behind a large garrison of French soldiers in Acre, under the command of Geoffrey of Sergines.