How do I get my reinforcements not AI controlled?

[Marcus Ulpius]

That's really annoying indeed. I remember in my Romani campaign when I was fighting huge Ptolemaoi empire I had 2 full stacks and they've brought their 2 stacks full of Pezhetairoi and their elite phalanxes. I couldn't win that with just 1 stack so had to give control of another 1 to the AI and in a stupid way the AI lost nearly all of it. The AI general with crappy cavalry bodyguards charged head on into the elite phalanx formation and died in seconds. But at least I've won the battle.

[SwissBarbar]

That's really annoying indeed. I remember in my Romani campaign when I was fighting huge Ptolemaoi empire I had 2 full stacks and they've brought their 2 stacks full of Pezhetairoi and their elite phalanxes. I couldn't win that with just 1 stack so had to give control of another 1 to the AI and in a stupid way the AI lost nearly all of it. The AI general with crappy cavalry bodyguards charged head on into the elite phalanx formation and died in seconds. But at least I've won the battle.

you still won, even though an AI general lead your reinforcement-fullstack army against 2 fullstacks of ptolemy with elite units (i know them well from my romanii campaign). Respect mate!