Caesar: Epic Battle of Alesia Game - 1976 - Avalon Hill - New Old Stock
The large mapboard 33"x28" portrays the town of Alesia and all of the works built by Caesar. The Gauls have a small force trapped in the town including Vercingetorix as well as a large force which sets up in off board areas. The Gallic player must reveal which off board zones he occupies with at least 1 unit, but does NOT have give further information.
The goal of the game is for the Gauls to create an escape route for Vercingetorix and exit him off the board. The Romans must prevent this over the 20 game turns (which represents 2 days).