The Scottish embassy he eventually collected at Norham had been delayed, and it was on the return journey that the Duke of Somerset with Lords Roos and Hungerford, Sir Richard Turnstall, and Sir Thomas Findern and the bulk of the Lancastrian army (approximately 5,000 men) ambushed Montagu at the Battle of Hedgeley Moor on 25 April 1464. The assault failed, and left Sir Ralph Percy dead on the field.