Upon the death of his brother in 1422, Humphrey became Lord Protector to his young nephew Henry VI. He also claimed the right to the regency of England following the death of his elder brother, John, Duke of Bedford, in 1435. Humphrey's claims were strongly contested by the lords of the king's council, and in particular his half-uncle, Cardinal Henry Beaufort. Henry V's will, rediscovered at Eton College in 1978, actually supported Humphrey's claims. In 1436 Philip, Duke of Burgundy, attacked Calais. Duke Humphrey was appointed garrison commander. The Flemings assaulted from the landward but the English resistance was stubborn. Humphrey marched the army to Baillieul, taking the English to safety; he threatened St. Omer before sailing home.