It had been Henry’s intention to come to Gascony and show that it could be ruled with peace and understanding. When he arrived in 1253, he found he had a war on his hands and that some of his subjects, again led by the queen’s relations, had switched their allegiance to the king of neighboring Castile. He not only had to resort to the same harsh tactics employed by de Montfort but even asked his brother-in-law to come and lend his military expertise. Simon grudgingly went, motivated by loyalty and his spiritual adviser, Robert Grosseteste, who reminded him not to forget all the benefits he had received from Henry. The king’s treachery was not forgotten, however, and de Montfort made him pay dearly in compensation. In the end, Henry’s campaign proved to be his only successful adventure abroad. He won over the Gascons to his son’s overlordship and got Alfonso, the king of Castile, to give up rival claims to the region by having Edward marry his half-sister, the third Eleanor in this story.