On the eve of St. Martin's Day the fleet arrived at Zadar. The attack on Zadar took the form of an amphibious landing followed by a brief siege. Chains and booms were laid across the mouth of Zadar's harbor as a defense, but the crusaders burst through them in their Venetian ships and landed their troops and equipment near the city, where they made a camp. Citizens of Zadar hung flags with crosses on the walls, showing that they were a Christian city. Some of the Crusader leaders, including Simon de Montfort, Robert de Boves and Guy of Vaux-de-Cernay, refused to take part in the siege and requested that the city be spared. On behalf of the Pope, Guy of Vaux-de-Cernay read a letter delivered by Peter of Lucedio and forbade the conquest of the city "because it is a city of Christians, and you are pilgrims". However, most of the crusaders sided with Enrico Dandolo, while Simon de Montfort and other crusaders who refused to participate in the siege camped further away from the city.