The Conquest of GaulBy: Julius Caesar Between 58 and 50BC Caesar conquered most of the area now covered by France, Belgium and Switzerland, and twice invaded Britain. This is the record of his campaigns. Caesar's narrative offers insights into his military strategy & paints a fascinating picture of his encounters with the inhabitant of Gaul and Britain, as well as offering lively portraits of a number of key characters such as the rebel leaders and Gallic chieftains.