1. The Definitive Tactical Choice: Company of Heroes: Eastern Front

It focuses on high-level operational decisions, such as cutting off enemy supply lines and managing troop morale through the changing seasons.

If you want something released more recently that captures the "Unknown War" vibe: TOP 3 EASTERN FRONT WORLD WAR 2 STRATEGY GAMES

Created by Chris Crawford in 1981, this is widely considered one of the first and best grand strategy games ever made. It puts you in charge of the German invasion of Russia.

New units like the T-34 tank, Katyusha rocket launchers, and unique reward trees for Soviet and German forces.