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 decided 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.

Demetrius:

• left wing: 2,900 cavalry, 1,500 light infantry and 30 war elephants under Demetrius command
• center: 11,000 infantry phalanx and 13 elephants
• right wing: 1,500 cavalry

Ptolemy:

• left wing: 3,000 cavalry
• center: 18,000 phalanx
• right wing: 1,000 cavalry