Raw numbers mean nothing.
More important is the belief in the justice of one’s cause and the willingness to die for one’s country.
The Germans had the initial advantage of surprise and technological superiority in the opening stages of Operation Barbarossa but they stalled.
The Soviets had enormous manpower, put together a high quality fighting force and showed enormous courage under a seemingly hopeless situation.
They turned the tide at Stalingrad - we marked the 72nd anniversary of the outcome of that battle yesterday - a pivotal moment in world history in which in the European theater the intiative passed over onto the Soviet side.
Battle of Salsu; 612 AD
(http://en.wikipedia.org/wiki/Battle_of_Salsu)
350,000 Sui Dynasty Chinese vs 10,000 Goguryeo Korea.
“This led to an overall campaign loss of all but 2,800 Sui troops out of 350,000 men.”
(Almost no casualties among the Koreans)