Bring in the axes and the machetes, You've got a lot of wood to chop.
Here's one that I find to be pretty funny. So I'm playing the Sengoku scenario on Cheiftain to amuse myself. Obviously, I am an age and a half in tech ahead of all the AI's.

So anyway, I recently got Ninjutsu and started building a bunch of Ninja, then sent them to terrorize the other clans, and steal their workers. I just captured a Saito worker, and sent him south. He was still in their territory, so their leader asked them to leave, saying "Your troops". They're asking their own captured workers to leave their territory! If only they had Ninja...
...Lesson: Ninja rule!
Sigh... The AI are such idiots.