 In 1346, for example, no longer serving under Northampton, he served with the Prince of Wales, with whom FitzWalter indentured to serve for six months at a wage of 100 marks.In return he brought the Prince 20 men-at-arms (himself, four other knights and 15 esquires) and 12 archers.As part of the Black Prince's vanguard FitzWalter fought at the Siege of Calais in 1346.