Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
Time to a new ground battle where we can check how is more powerful, the AT-AT watched in the Rebels Tv serie or the regular AT-AT from the Episode V in the Hoth attack.
The RAT-AT? xD
It can sound to Rebels AT-AT but it is by Recon AT-AT.
Oh, I meant to point out that it sounds like a machine gun noise - “Ratatata”, and also like “Rat attack” and the planet “Rattatak” in Star Wars.
Just they are coincidences.