Which additional realistic cases could you think of (including in alternate history) of large countries being conquered by smaller countries? I could imagine Germany conquering the Soviet Union had it succeeded in conquering and holding Moscow in 1941-1942, in Japan conquering China had it avoided occupying French Indochina and thus provoking the US, and of course in real life's example of Britain conquering India and subsequently holding it for a couple of centuries. I suppose that one could also look at the Mongol conquests of China, Persia, Mesopotamia, Russia, et cetera during the late Middle Ages and the Polish conquest of Muscovy in the 1610s had it actually been successful.
Anyway, which additional examples of this can you think of?
Anyway, which additional examples of this can you think of?