Okay, I get your point. However, there really was no Red Army in existence in 1917/1918, so I assumed you were referring to WWII, when it was very much in existence.
The Red Army (Russian: Рабоче-Крестьянская Красная Армия, Raboche-Krest'yanskaya Krasnaya Armiya; RKKA, full translation Workers' and Peasants' Red Army) were the armed forces first organized by the Bolsheviks during the Russian Civil War in 1918 (Jan. 28) and that, in 1922, became the army of the Soviet Union. -Wikipedia
These were the forces led by Leon Trotsky against the White forces. Had Germany not been defeated in 1918 they would have been in Trotsky's rear as he tried to defeat the White forces.