The Battle of Gaza was a battle of the Third war of the Diadochi between Ptolemy (satrap of Egypt) and Demetrius (son of Antigonus I Monophthalmus). Ptolemy launched an invasion of Syria. With 18,000 infantry and 4,000 cavalry he arrived to Gaza in early 312 BC. Demetrius decided to offer him battle, but was routed; losing 500 men killed, a further 8,000 taken prisoner, and losing all his elephants. He retreated to Tripolis in Phoenicia. Demetrius: Ptolemy: * left wing: 3,000 cavalry * center: 18,000 phalanx * right wing: 1,000 cavalry