The Wild Thornberrys (1998) : 1x18

Eliza convinces a group of baboon-like apes to stand up to their legendary adversaries--""The Others."" Darwin, meanwhile, has met an almost identical group of apes with an identical problem. As Eliza and Darwin lead their separate groups into battle, they suddenly find themselves face-to-face--in an all out war! Now it's up to Eliza to quickly find a way avert the battle and teach the apes to get along.