In October 1642, the armies of King Charles I and Parliament meet at Edgehill in Warwickshire, the first major pitched battle of the English Civil War. The film follows historians and battlefield walks across the ridge and the flat ground below it, reconstructing how Prince Rupert's cavalry charge scattered the Parliamentarian horse early on, and why that early success did not translate into a decisive win. Maps and terrain analysis show the confused, muddy fighting that followed as infantry blocks collided in the center, with neither commander able to force a breakthrough before nightfall ended the killing. The battle's real significance sits in its outcome: both sides claimed victory, both armies remained intact, and the war that many expected to end quickly instead settled into years of grinding conflict. Expert commentary places Edgehill in the wider context of a kingdom dividing against itself, using the battle as the moment the Civil War stopped being a crisis and became a war of attrition.