In 1509 Magnus and Henry's daughter Catherine married, which sealed the reconciliation of Henry and Magnus. In 1511, Henry, together with the other members of the House of Brunswick-Lüneburg, conquered the County of Hoya, which had refused to recognize Brunswick-Lüneburg as its liege lord. A second attack on East Frisia in 1514—in the course of the Saxon Feud—led to Henry's death; his head was shot off during the siege of Leerort Castle (today part of Leer).