10 Roman legions besiege a Gallic force in Alesia, and they are in turn besieged in their siege works by a relieving Gallic force. This hex and counter game is Volume XI in the Series: Great Battles of History (GMT Games) series by GMT. The game uses similar mechanics to other games in the series; however, It is centered around a siege instead of a more traditional set piece battle common to the other games in the series. Therefore it has the most changes to the GBoH rules than the other games. There are no specific turns, and play simply passes back and forth between the two sides, possibly interrupted by the abilities of the opposing commanders. The game includes three different scenarios.