In 55 B.C. Julius Caesar crossed into Britain and was immediately engaged in a unique style of warfare. The Iron Age Britons used sturdy and fast two-horse chariots to respond to Roman invasion. This article looks at the tactics of and analyzes aspects of the battle chariot. It assesses the capabilities of the people who fielded the chariot and the means used to sustain their resources and gauge their capabilities. Drawing on both classical and archaeological sources, this article presents a fuller account of Caesar’s two trips to Britain in 55–54 B.C. and the British warfare he encountered.