The Saga of Tanya the Evil, Vol. 19 (manga)

After surviving the Commonwealth's assault, the 203rd Battalion advances toward Parisii, the capital of the François Republic. Mocking the Republican Army's feeble attempts at resistance, Tanya assures herself that there's no way the Empire could get Dunkirk'ed like its equivalent from her previous life—but when her knowledge of history clues her in to something no one else can see, she may have to take matters into her own hands...

Volume 19 of The Saga of Tanya the Evil manga series by Carlo Zen.