sentences:  When in 1542 Elector John Frederick I of Saxony and Landgrave Philip I of Hesse as members of the Protestant Schmalkaldic League came to the help of Goslar, they managed to occupy the complete Principality of Wolfenbüttel.Henry fled to the Duchy of Bavaria.In 1545, Henry recruited an army with the support of Emperor Charles and managed to take control of parts of Wolfenbüttel.