Gallic Wars, series of military campaigns (58–51 B.C.) by Julius Caesar. As governor of Transalpine Gaul, Caesar drove out invading German tribes while occupying more territory in Gaul, until almost the whole country was in Roman hands (55 B.C.). In 53–52 B.C. he put down revolts by the chieftains Ambiorix and Vercingetorix. Caesar wrote Commentaries on the Gallic War (c.50 B.C.).