accounts, perhaps as many as several thousand) Muslim Arabs and Hindu Indians. Despite a desperate defense by crossbowmen, more than 50 Portuguese were killed. The remaining defenders retreated to the ships, some by swimming. Thinking that the attack was the result of unauthorized incitement by jealous Arab merchants, Cabral waited 24 hours for an explanation from the ruler of Calicut, but no apology was forthcoming. The Portuguese were outraged by the attack on the factory and the death of their comrades and seized ten Arab merchant ships at anchor in the harbor. Around 600 of their crews were killed and the cargoes confiscated before the merchantmen were set afire. Cabral also ordered his ships to bombard Calicut for an entire day in reprisal for the violation of the agreement. The massacre was blamed in part on Portuguese animosity towards Muslims, which had developed over centuries of conflict with the Moors on the Iberian peninsula and in North Africa. Moreover, the Portuguese were determined to dominate the spice trade and had no intention of allowing competition to flourish. The Arabs also had no desire to allow the Portuguese to break their monopoly on access to spices. The Portuguese had started out by insisting on being given preferential treatment in every aspect of the trade. The letter from King Manuel I brought by Cabral to the ruler of Calicut, which was translated by the ruler's Arab interpreters, sought the exclusion of Arab traders. The Muslim merchants believed that they were about to lose both their trading opportunities and livelihoods, and attempted to sway the Hindu ruler against the Portuguese. The Portuguese and Arabs were extremely suspicious of each other's every action. Historian William Greenlee has argued that the Portuguese realized that "they were few in numbers and that those who would come to India in the future fleets would always be at numerical disadvantage; so that this treachery must be punished in a manner so decisive that the Portuguese would be feared and respected in the future. It was their superior artillery which would enable them to accomplish this end." Thus, they created a precedent for the gunboat diplomacy used by European powers in Asia during the following centuries. Return to Europe Warnings in reports from Vasco da Gama's voyage to India had prompted King Manuel I to brief Cabral regarding another port to the south of Calicut where he could also