Saga of Tanya the Evil Movie
In 1926, it's UC. A group led by Major Tanya Degurechaff has won the fight to the south against the Republic's last-minute soldiers. Expect to be given a vacation after they come back victorious. Instead they get special orders from Staff HQ when they get back home, which isn't what they thought. That there were signs of a big deployment near the Empire-Federation border, they are told.