[4] Changing into Bavarian service in the army of the Catholic League in 1631, he became Generalfeldwachtmeister and campaigned in Hesse against Landgrave William V of Hesse-Kassel from which he captured the Princely Abbey of Fulda.

Promoted to Feldzeugmeister in 1632, he occupied Windsheim and Rothenburg ob der Tauber, and received an independent command in Swabia to defend Bavaria's western border.

For his service to the League and the Habsburgs, he was promoted to Knight of the Order of the Golden Fleece by the King of Spain and elevated to Count of the Empire.

[4] In 1635, he was appointed to governor of Augsburg, where his rule aroused much discontent because he replaced the Protestant municipal council by Catholic councillors and enforced severe contributions on the citizens.

[4] After a complaint of the protestant citizens reached Emperor Ferdinand II in 1636, Fugger was dismissed as governor but retained military command of the city.