(June 14, 1645) Decisive battle in the English Civil Wars between the Parliamentary New Model Army and the royalist army of Charles I .
The two armies met near Naseby, south of Leicester, and deployed along parallel ridges. The 10,000-man royalist force under Prince Rupert drove back part of the Parliamentary cavalry but then engaged in wild pursuit, leaving the royalist infantry exposed. The more disciplined Parliamentary force under Oliver Cromwell regrouped and counterattacked, routing the royalists and taking 4,000 prisoners. With the loss of his best soldiers, Charles could no longer meet the New Model Army in open battle and effectively lost the war.