When King Gustav II Adolf of Sweden landed in Peenemünde in 1630, Francis Henry entered his service and earned his affection. He fought as colonel and regiment commander under general Johan Banér and was victorious in the Battle of Wittstock in 1636. Gustav Adolf gave Francis Henry the estates of the nunnery of Marienfließ Abbey in Pomerania. On 28 June 1643 Gustav Adolf's daughter, Christina of Sweden, leased Marienfließ to Francis Henry for 10 years, after which it reverted to the new ruler of Pomerania, Frederick William, the Great elector, on 12 December 1653, rewarding Francis Henry's improvements to the estate.