This is coolbert: In a previous post, I mentioned the Mongol winter campaign against Russia. Well, according to De Puy, in the year 1226, the Mongols fought perhaps their greatest battle under the command of Genghis. 150,000 Mongols against 300,000 rebels of the Chin Empire (northern China). This battle was fought in December on the banks and on the ice of the Yellow River. It seems that the Mongols had a penchant for fighting in the winter. Accustomed to a rugged, cold climate (Ulan Bator has the coldest climate of any world capital), and taking advantage of being being able to cross rivers that for most of the time are impassible, or very difficult to cross, this makes a lot of sense, doesn't it?