In 1205 Chinggis khaan chose to attack China in late-winter, through Gobi desert from where China didn't anticipate that Mongols should show up. How to meet Gobi desert where water is scant with 60,000 warriors with 3 ponies each? Utilizing softened day off puddles as a water source. Mongols actually use day off ice to make tea.
2. Solidified lakes and waterways permitted to have alternate routes.
In the colder time of year time Mongols could experience Khuvsgul, Baikal or some other waterways and lakes without contemplating flooding or intersection the profound water with ponies.
3. Mongol ponies. Contrasting and slow down ponies Mongol ponies brush and quest for food all alone, in the colder time of year eat snow rather than water. Mongol rangers had no issue attacking throughout the colder time of year.
4. Russians didn't anticipate any intrusions throughout the colder time of year, Mongols could assault out of the blue . Cold winter and thick snow could slow foes' break.
5. The military could convey more food(frozen meat) and chase throughout the colder time of year if essential without stressing over killing child creatures. (Generally denied to chase during the rearing season or slaughter child creatures)

