It’s moreso that it was pretty common for armies to meet at the border of the defending state or a natural chokepoint, so if the defenders lose that battle, there’s only so many soldiers and conscripts left in reserve. And then as you lose more and more, you’re left with greener troops/conscripts, and anyone who survived earlier skirmishes would be rather beleaguered.
But actually, this is the exception. For every successfully invaded country or region, there’s some idiot who tried to march on Russia in the September.
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