From the official website:
Advance of the Reich is a tactical level simulation of the fierce fighting during the first half of the war in Russia.
This is the sixth installment of the award-winning tactical level game system by John Tiller. It contains 33 individual scenarios covering the fighting from June 1941 until December 1942.
Features include satchel charges, smoke, wire, mines, parachutes, artillery, mortars, armored fighting vehicles, binoculars, sewers, swim tanks, and many more. Players typically control several squad sized elements and possibly several vehicles in each scenario.
Includes German, German SS, Russian, Russian Guards, Italian, Rumanian, Militia, and Russian Naval soldiers and a very complete vehicle and weapon database from the 1941 to 1942 time period on the Eastern Front.
Supports single person play against the computer, and multiplayer network play over LANs and the Internet.