Conversation so far:
What did Aleksandr do in the war?
During the war, Solzhenitsyn served as the commander of a sound-ranging battery in the Red Army, was involved in major action at the front, and was twice decorated.
Did he receive any other awards?
He was awarded the Order of the Red Star on 8 July 1944 for sound-ranging two German artillery batteries and adjusting counterbattery fire onto them, resulting in their destruction.
What else happened while he was in the war?
While serving as an artillery officer in East Prussia, Solzhenitsyn witnessed war crimes against local German civilians by Soviet military personnel.

Question: What type of crimes did he see?
Self-contained rewrite: What type of crimes did Aleksandr Solzhenitsyn see?