After the invasion of Naboo, they wondered why they even bothered having tanks for Droids to ride in at all. With this war machine, they took it to the next evolutionary step. Instead of having a droid driving a tank, you make the tank and the droid the same thing. Look, it's hard to say anything exciting about this. It's a tank. It rolls around and shoots things and gets blown up by Clones. They fought a bunch in the Battle Of Kashyyyk and were shut down after the Clone Wars ended.