03/09/2026
In this month: Siege of in 52 BC, in which Caesar was able to finally defeat Gallic resistance to .
This is perhaps the most famous siege of ancient , and shows a thoroughness and preparedness that, I think, has no rival.
Following a cavalry victory at the Vingeanne River, Caesar pursued Vercingetorix to the oppidum of Alesia and arrived around late July. Seeing the position on a high plateau, Caesar immediately chose a blockade over a direct assault. Trapped inside the hill fort were ~80,000 Gauls under Vercingetorix.
A massive relief host under Commius and Vercassivellaunos reached Alesia roughly 4 to 5 weeks into the siege (late August / early September). Estimated to have between 100,000 and 250,000 men, the host marched to crush the Romans. Perhaps outnumbered nearly 6 to 1, Caesar didn't retreat or abandon the siege.
Instead, ~50,000 Roman legionaries then had two massive lines of fortification:
1. The original Circumvallation (18 km facing inward) built to starve Alesia out.
2. Contravallation (21 km facing outward) to block the incoming relief army.
In total, over 35 KM of walls, moats, redoubts, and stakes surrounded the city. Caesar trapped the enemy inside while holding off a tidal wave from the outside. After a 4 days of sallying from the defenders and a simultaneous attacks from without, the Gauls were not able to dislodge the Romans. Vercingetorix capitulated on the morning of the 5th day.
Incredible.
Art by Peter Dennis
Map by Reddit user trbanaban
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