 In April 1415 he attended the great council which approved plans for King Henry V's invasion of France, and on 5 August 1415 he was among the peers who tried Richard, Earl of Cambridge, and Lord Scrope after the discovery of the Southampton Plot on the eve of invasion.He crossed to France with the King's army, and was present at the taking of Harfleur and at the Battle of Agincourt.At the death on 29 September 1416 of Isabel, widow of William de Ufford, 2nd Earl of Suffolk, he succeeded to the castle and town of Orford and the manors of Parham and Ufford in Suffolk.