The senior Lancastrian general was Henry Beaufort, Duke of Somerset, an experienced leader credited with victories at Wakefield and St Albans, although others suggest they were due to Sir Andrew Trollope. Trollope was an extremely experienced and astute commander, who served under Warwick in Calais, before defecting to the Lancastrians at Ludford Bridge in 1459. Other notable Lancastrian leaders included Henry Holland, Duke of Exeter, and northern magnates the Earl of Northumberland, Lord de Ros and Lord Dacre. Another leading Lancastrian, Lord Clifford, had been killed by an arrow in the throat at Ferrybridge.