Hitler tried it and failed horribly, Napoleon tried before that and found equally terrible results, and the Swedes who fought in the Great Northern War would tell a similar story.
Supply lines running thin in the freezing cold and enveloping mud spells doom for anyone attacking into a Russian winter — or does it?
For some reason, history tends to overlook the many times Russia has lost in the cold, despite their home-turf advantage.
We might never find out, but what is amazing about helots is that there were seven of them per a single Spartan. You heard it right, seven slaves per a single free citizen.