The film tells the story of the Gallic chieftain Vercingetorix, from his childhood through to his battle to save Gaul from Roman domination at the hands of Julius Caesar.

Vercingetorix tries to reach his father, but Guttuart prevents the young boy from intervening and explains that destiny requires Celtill to meet his fate.

At Bibracte, capital of the Eduens tribe, various chieftains gather to hear Caesar speak of his invasion plan.

The Eduens also arrive at Gergovia, but they abruptly end their alliance with Rome because of Caesar's massacre of Avaricum.

During this Battle of Alesia, the Romans quickly build a circle of siege-fortifications around the city, trapping Vercingetorix and his forces.

Problems in the election of a commander for this Gallic relief army delays its arrival, but they finally reach the battleground.

Caesar is aware that his army will starve to death, but destiny intervenes when the Gauls demand that Vercingetorix lead them into what they believe will be a decisive battle.

The fortifications prove formidable, the Romans shoot volleys of arrows and javelins, and Caesar unleashes the Teutons into the battle.