Blitzkrieg General (1999)

Blitzkrieg General is much like an advanced version of Axis & Allies. The game has both basic and advanced rules.

From the publisher site:
Standard Features:
Complexity Low
Solitaire Suitability High
Time scale: 1 turn equals three months
Playing time: 2-12 hours
Players: One to Eight
Recommended Player Age 10 and up