Liga de Suabia
Casimir was a vassal of Emperor Maximilian I and fought in 1499 alongside his father and Margrave Christopher I of Baden as the commander of the Swabian League against the Old Swiss Confederacy and led the negotiations that resulted in the Peace of Basel. In subsequent years, he continued to be active as a military leader and diplomat in Habsburg service. He participated in 1506 in Schwäbisch Hall against the Swabian League and in 1509 in the Diet at Worms. In 1513, he was imperial commissioner at the assembly of the Swabian League at Nördlingen dealing with a breach of the peace by Götz von Berlichingen. Casimir and Duke William IV of Bavaria jointly oversaw the conduct of the war. In 1519, he took part in federal measures against Ulrich of Württemberg; in May 1519, he commanded 700 knights advancing to Ehningen.