One of the first computer games I ever bought was SSI's "Tigers in the Snow". The game was a WWII Battle of the Bulge simulation based on the Siege of Bastogne. I had it for the Commodore 64 but later picked it up a CGA version for the IBM PC. You had your choice of playing the US side and defending Bastogne or the German side and attacking Bastogne.
The game played like a classic board game with pieces moving across a hex map. It never failed that if I played the US I could almost never hold the city. If I played the Germans I could never take Bastogne. I found out much later that the game designers actually designed the game to cheat! I never found exactly how.