Conversation so far:
What was Aleksandr Solzhenitsyn's role during World War II?
During the war, Aleksandr 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 Aleksandr Solzhenitsyn win any awards or recognition?
Aleksandr Solzhenitsyn 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.

Question: Where did he serve during the war?
Self-contained rewrite: Where did Aleksandr Solzhenitsyn serve during  World War II?