Cromwell and Fairfax had recruited their New Model Army in the early months of 1645, taking advantage of King Charles I’s hesitation in attacking them to consolidate and train.
At Naseby, on June 14, 1645, the decisive battle of the English Civil War was fought. The Parliamentarian forces, under Cromwell, outnumbered the Royalists by almost two to one, and also commanded a stronger position. As the battle drew on, many of the Royalist soldiers surrendered, while other withdrew in disarray. The King, soundly defeated, fled to Scotland.