Doges, Snaches, and Those Guys spawn as peons though out the stage.
After 15 seconds Hippoe spawns, and Hippoe and Jackie Peng start spawning every 25 seconds afterwards.
After the enemy base loses a couple thousand health, a Squire Rel and 3 Kang Roos are sent out.
An extremely easy stage that requires little strategy, because at this point you have already faced much harder subchapters to get to this stage. Just use the Hippoes and Jackie Peng to generate money to spawn your attackers and meatshield the Kang Roos.