In 1190 Henry left for the East, after having his barons swear to recognize his younger brother Theobald as his successor should he fail to return. He joined the Third Crusade, arriving ahead of his uncles, Kings Philip II of France and Richard I of England. Initially, he was one of the leaders of the French contingent at the siege of Acre before Philip's arrival. He is said to have been a member of the group involved in the abduction of Queen Isabella I of Jerusalem, to get her to consent to a divorce from Humphrey IV of Toron so that she could be married to Conrad of Montferrat. Henry was related to Conrad through both his maternal grandparents. According to Baha ad-Din ibn Shaddad, he was wounded at Acre on 15 November.