You should correct me if I'm wrong, but just before the Babylonian war, Antigonos send his satraps Nicanor and Evagoras to Seleukos in the east. Seleukos had far less soldiers than both Nicanor and Evagoras. So what did he do? He and his army hid in the marshes and waited for Nicanor and Evagoras. Then he surprise-attacked the Macedonian elite of Nicanors and Evagoras army at night. Evagoras was killed and Nicanor fled. The rest of the army were so scared they decided to surrender and fight for Seleukos in the future. I think you can describe this as last stand. Seleukos had nowhere to go.