Pisan ships) in the port. Acre is again cut off from reinforcements; the city's supplies are exhausted, and the Muslim garrison has to resort to eating their own beasts. In the event, troops are driven to cannibalism. April – After a long siege Muslim forces under Saladin capture Beaufort Castle from Reginald of Sidon who has offered to hand over the castle to Saladin on the condition that he has three months to remove his family to a place of safety. At the end of the three months, Saladin expects the castle to be handed over but finds that Reginald has used the time to strengthen the castle against a siege. He is imprisoned at Damascus – the castle's garrison finally surrenders in return for Reginald's release. May 5 – Siege of Acre: A Crusader force under King Guy of Lusignan attacks the city with three siege engines, but all are destroyed by the Muslim defenders with Greek fire, a highly flammable liquid. An Egyptian flotilla is able to avoid the Pisan fleet (some 50 ships) and resupply the city with new provisions. Saladin launches a massive eight-day attack on the Crusaders two weeks later. Meanwhile, in the Crusader camp the conditions are deteriorating by disease and famine, among the soldiers. May 18 – Battle of Iconium: German forces under Frederick I defeat the Seljuk army (40,000 men) in a pitched battle. They are routed, leaving the city at the mercy of the German Crusaders. Frederick does not pursue the Seljuks, because his forces have been weakened by food shortage for the previous weeks. His 23-year-old son, Frederick VI, takes Iconium (modern-day Konya) and proceeds to massacre the citizens. The Germans take booty amounting to 100,000 marks in the Turkish capital. June 10 – Frederick I drowns while crossing (or bathing in) the Göksu River near Selucia (modern-day Silifke) in Armenian Cilicia. The German Crusaders are demoralized and exhausted by the summer heat, Frederick VI takes over the command of his father, carrying with him the emperor's body preserved in a barrel of vinegar. Some of the German nobles decide to return home with their followers; Frederick continues with his army (some 5,000 men) and eventually reaches Antioch, on June 21. September 24 – A Crusader fleet attempts to destroy the Tower of Flies at Acre, which guards the city's harbour, by ramming vessels loaded with combustibles into it. At