시즌 1, 에피소드 4: It's 52 BC and the great Roman Commander Julius Caesar is butchering is way through Gaul. Thanks in large part to the iron will of Caesar, the Romans complete their long quest for total Mediterranean dominance, defeating the Gauls in the final battle of the Gallic Wars. For a period of time though, Gallic victory seemed possible. Out-numbering the Romans five to one, they held the high ground, on the hilltop fortress city of Alesia. Caesar besieges Alesia, however, and builds a wall around the city cutting it off from all possible supply lines. When Gallic reinforcements arrive to break the blockade, Caesar puts a startling twist on his strategy by constructing a second wall between his army and the reinforcements. It is siege upon siege, but Caesar knows the Romans, although fewer in numbers, are better supplied.