Necessary, but not sufficient condition though.
Sweden tried in the winter, and failed for example.
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Pro-tip: invade from Mongolia.
You thought of this in the shower? I feel dumb.
How’d that work out for Napoleon and Hitler, just to name a couple.
Found: https://www.wikipedia.org/wiki/Invasion_of_Russia
But can’t be arsed working out which started in winter vs which where destroyed by winter.
