Explanation: The Mongols (top/first) waited for good weather to invade enemy countries - typically whatever was the best season, locally, for grazing, but sometimes waiting instead for rivers to freeze for easy crossing.
The Nazis (second) invaded the USSR in the summer, and did little-to-no preparation for the inevitable and brutal oncoming Russian winter. They froze and died in great numbers, lmao.
The Swedish Empire (third) made the dubious decision to invade Russia in one of the worst European winters on record in the Great Northern War despite having good prospects for peace, resulting in the previously-winning positioning of the Swedish Empire reversing to a position of weakness and desperation.
And the newborn USA managed to kill a fair number of our own troops because we weren't fucking prepared for our OWN winter in 1777-1778. In our meager defense, the Continental Army's logistics were 'strained' to say the least to begin with, and it wasn't like we had planned for... much of anything, even the outbreak of the war itself.