Henry went to France in 1745 to help his brother, Prince Charles Edward Stuart ("Bonnie Prince Charlie", or "the Young Pretender") prepare the Jacobite campaign of that year. After its defeat, Henry Stuart returned to Italy. On 30 June 1747 Pope Benedict XIV conferred him with tonsure and created him Cardinal-Deacon of "S. Maria in Portico" in special consistory held on the 3 July 1747. On 27 August 1747 he was promoted to the four minor orders by the Pope. He received the subdiaconate on 18 August 1748 and diaconate on 25 August 1748. He was ordained priest on 1 September 1748 and consecrated titular Archbishop of Corinth on 2 October 1758.