Antigonos skilfully exploited dissensions among the other satraps to extend his power first over all Asia Minor, then into Syria and into the East as far as Persis.
No wonder Antigonos was wary of him, after the two of them traded insults at a meeting.
He reported to Ptolemy that Antigonos was on his way west with a victorious army bigger than anyone else's, and a huge treasure.
In 312 BC, after three years of war, Ptolemy and Seleukos succeeded in beating Antigonos' army in battle at Gaza in Palestine.
His hope that his western allies would keep Antigonos occupied were largely realised, but he was attacked nonetheless, by Nikanor, Antigonos' governor of Media, east of Babylonia.
The Babylonians suffered for their choice, for Seleukos was soon attacked by Demetrios, the son of Antigonos, and he chose to let Demetrios waste much of his strength on a siege of Babylon city, in which a good part of it was wrecked.
If Antigonos could not beat him, no one else could, and it allowed him to turn further east to gather in more territory.
Since the second type aimed so much higher it is not surprising that none succeeded, though both Antigonos and Seleukos came very close.
They were to be instumental in the defeat -- the final defeat -- he was soon to inflict on Antigonos.