Thank you for the help. I sliced the controls of the AT ATs in the first two screenshots but the heads are still intact. I didn't know I was supposed to destroy the heads. I should had figured it out after the third AT ATs head exploded after I shot it. I haven't seen any cutscenes yet. This is a great level set and I'm glad I finally get to move on to level 2 now that I know what to do.
My dream, to watch Imperial ships explode in my gunsights.