Editing 312 BC (section)

==== Syria/Mesopotamia/Babylonia ====
* [[Ptolemy I Soter|Ptolemy]] raids [[Antigonus I Monophthalmus|Antigonus]]' territories in [[Cilicia]] and Syria, and then sails back to Egypt.<ref>Diod. XIX 79,6–7</ref>
* At the end of the year, [[Ptolemy I Soter|Ptolemy]] invades [[Antigonus I Monophthalmus|Antigonus]]' territories in  Palestine with an army of 18,000 infantry and 4,000 cavalry. The resulting [[Battle of Gaza (312 BC)|Battle of Gaza]] leads to a triumph for Ptolemy over [[Antigonus I Monophthalmus|Antigonus]]' son, [[Demetrius Poliorcetes|Demetrius]].<ref>Diod. XIX 80–86</ref>
* [[Demetrius Poliorcetes|Demetrius]] rallies the remnants of his army at [[Tripoli, Lebanon|Tripolis]] and summons reinforcements from the garrisons of upper Syria and [[Cilicia]]; he also writes his father,  [[Antigonus I Monophthalmus|Antigonus]], and urges him to send help. Meanwhile [[Ptolemy I Soter|Ptolemy]] captures [[Acre, Israel|Acre]], [[Jaffa|Joppa]], [[Samaria]] and [[Sidon]], and starts to besiege [[Tyre, Lebanon|Tyre]].<ref>Diod. XIX 84,4–86,1</ref>
*[[Seleucus I Nicator|Seleucus]] ceases his service to Ptolemy and returns to his former province, Babylonia. This event takes place on October 1 and becomes the starting point of the [[Seleucid era]].<ref name="Diod986">{{cite book|last=Siculus|first=Diodorus|title=Library|url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Diodorus_Siculus/19E*.html#86|volume=XIX|chapter=86}}</ref>