Undeterred by the terms of these newly formed peace treaties, Qalawun sacked the "impregnable" Hospitaller fortress of Margat in 1285, and established a Mamluk garrison there. He also captured and destroyed the castle of Maraclea. He captured Latakia in 1287 and Tripoli on April 27, 1289, thus ending the Crusader County of Tripoli. The Fall of Tripoli in 1289 was spurred by the Venetians and the Pisans, who opposed rising Genoese influence in the area. In 1290, reinforcements of King Henry arrived in Acre and drunkenly slaughtered peaceable merchants and peasants, Christians and Muslims alike. Qalawun sent an embassy to ask for an explanation and above all to demand that the murderers be handed over for punishment. The Frankish response was divided between those who sought to appease him and those who sought a new war. Having received neither an explanation nor the murderers themselves, Qalawun decided that the ten-year truce he had formed with Acre in 1284 had been broken by the Franks. He subsequently besieged the city that same year. He died in Cairo on November 10, before taking the city, but Acre was captured the next year by his son Al-Ashraf Khalil.