Just checked out the 1812 French invasion of Russia. An incredible comeback indeed, even if they did retreat quickly on purpose at times. Again, Russian winters are insurmountable (unless you're Finland lol).

What was the greatest military comeback of all time?

For example, during the Korean War, when the South Koreans were squeezed all the way to just Busan, then proceeded to occupy 90% of the Korean peninsula over the next few months. Or the turnaround the Soviets had during WW2 when they retook all their land from Germany, and even ended up pushing into Berlin.

Basically, what is the war equivalent of the Patriots 28-3 comeback in the Super Bowl?