Beaumont was present for some of the most notable events of Henry VI's reign. He was present at the arrest of Humphrey, duke of Gloucester in 1447, helped defend the king against Jack Cade's Rebellion in 1450, and helped suppress the rebellion of Richard, duke of York in 1452. While York and his allies ended up fighting against the king, Beaumont remained loyal to the Lancastrian crown during the 1450s, which saw the beginning of the Wars of the Roses. His personal loyalty to Henry VI eventually cost him his life – he was killed, bodyguarding the king, at the battle of Northampton in 1460. Beaumont's son, William Beaumont, continued the struggle against the Yorkists.