The attack on Russia from Germany was a complete surprise attack.
It was expected that Germany would win the fight with Russia.
Extreme weather conditions caused a huge part of the deaths of many soldiers, and damages a lot of machinery and tools soldiers used for war.
Russian women served in the war as well and fought along side men.
"Order No. 270" was an order that Joseph Stalin declared, which was that no Russian troop were to stop fighting until the last man were to be executed. If any troop surrendered or gave up, then they were to be executed once they returned home.
The largest tank in history was used during battle.