Second Russian Civil War

Background
On January 21st, 1924, Vladimir Lenin died. He spearheaded the Russian Revolution, and was the most important figure in the Soviet Union. When he died, there were two possible successors; Joseph Stalin and Leon Trotsky. In our timeline, Stalin eventually won out peacefully. However, in this timeline, another civil war erupted from this.

The Beginning
The civil war didn't begin immediately. The fighting started on November 8, 1927. Trotsky and his followers were peacefully protesting, when the army came in. The Trotsky supporters made barricades, and the Soviet Army was forced to start a siege. Then, Trotsky and Stalin supporters poured into Moscow to help their respective causes.

On November 24, 1927, Stalin attempted to evacuate from Moscow, but was captured by Trotsky supporters, and taken prisoner. On December 5, the Siege of Moscow was broken, and Trotsky was taken prisoner by Stalin supporters. With the two sides in stalemate,