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Campaign against the Crusaders

As sultan, Baybars engaged in a lifelong struggle against the Crusader kingdoms in Syria, in part because the Christians had aided the Mongols. He started with the Principality of Antioch, which had become a vassal state of the Mongols and had participated in attacks against Islamic targets in Damascus and Syria. In 1263, Baybars laid siege to Acre, the capital of the remnant of the Kingdom of Jerusalem, although the siege was abandoned when he sacked Nazareth instead. He used siege engines to defeat the Crusaders in battles such as the Fall of Arsuf from 21 March to 30 April. After breaking into the town he offered free passage to the defending Knights Hospitallers if they surrendered their formidable citadel. The Knights accepted Baybars' offer but were enslaved anyway. Baybars razed the castle to the ground. He next attacked Atlit and Haifa, where he captured both towns after destroying the crusaders' resistance, and razed the citadels.

In the same year, Baybars laid siege to the fortress of Safed, held by the Templar knights, which had been conquered by Saladin in 1188 but returned to the Kingdom of Jerusalem in 1240. Baybars promised the knights safe passage to the Christian town of Acre if they surrendered their fortress. Badly outnumbered, the knights agreed. Upon surrender, Baybars broke his promise and massacred the entire Templar garrison. On capturing Safed, Baybars did not raze the fortress to the ground but fortified and repaired it instead, as it was strategically situated and well constructed. He installed a new governor in Safed, with the rank of Wali.

Later, in 1266, Baybars invaded the Christian country of Cilician Armenia which, under King Hethum I, had submitted to the Mongol Empire. After defeating the forces of Hethum I in the Battle of Mari, Baybars managed to ravage the three great cities of Mamistra, Adana and Tarsus, so that when Hetoum arrived with Mongol troops, the country was already devastated. Hetoum had to negotiate the return of his son Leo by giving control of Armenia's border fortresses to the Mamluks. In 1269, Hetoum abdicated in favour of his son and became a monk, but he died a year later. Leo was left in the awkward situation of keeping Cilicia as a subject of the Mongol Empire, while at the same time paying tribute to the Mamluks.

This isolated Antioch and Tripoli, led by Hethum's son-in-law, Prince Bohemond VI. After successfully conquering Cilicila, Baybars in 1267 settled his unfinished business with Acre, and continued the extermination of remaining crusader garrisons in the following years. In 1268, he besieged Antioch, capturing the city on 18 May. Baybars had promised to spare the lives of the inhabitants, but he broke his promise and had the city razed, killing or enslaving much of the population after the surrender. prompting the fall of the Principality of Antioch. The massacre of men, women, and children at Antioch "was the single greatest massacre of the entire crusading era." Priests had their throats slit inside their churches, and women were sold into slavery.

Then he continued to Jaffa, which belonged to Guy, the son of John of Ibelin. Jaffa fell to Baybars on 7 March after twelve hours of fighting; most of Jaffa's citizens were slain, but Baybars allowed the garrison to go unharmed. After this he conquered Ashkalon and Caesarea.