Talbot was already a knight when, on 26 July 1444, he was created Lord and
Baron Lisle of
Kingston Lisle in
Berkshire by
Henry VI, his mother being one of the co-heirs to the previous creation of the barony. He stood to inherit much of her estates in Wales on the
Welsh Marches, and in Gloucestershire at
Painswick. She had fought long and hard to enfranchise her son for the duration of the Berkeley feud, in which the young nobleman's manor house was raided by Lord Berkeley's brothers. After 1449, his mother was one of three co-heiresses to her father, and through her, he possessed a claim on
Berkeley Castle. In 1451, already a veteran of the fight at St Barnets Green, he was created
Viscount Lisle. In prosecution of the claim against
James Berkeley, 1st Baron Berkeley, the heir-male, he stormed
Berkeley Castle in 1452 and took the Baron and his sons prisoner. Ordered to recruit reinforcements for the English army in France, he found 2325 men at
Dartmouth and
Plymouth before embarkation on 5 March 1453. He was joined by the Lords Moleyns and Camoys, as he led troops into
Guyenne to reinforce his father. They sailed to
Bordeaux but still the English army numbered only 8,000, facing an enemy force of 10,000. They were still awaiting reinforcements when they marched out, capturing an outpost at St Laurent on 17 July 1453. That day they fought the last pitched battle of the
Hundred Years' War at
Castillon. Both father and son were killed during the battle. Some chroniclers assert that when his wounded and unhorsed father begged him to quit the field and save himself, he refused, preferring death to dishonour; a scene memorialized by
William Shakespeare in
Henry VI, Part I, Act IV, Scene VI. ==Marriage and issue==