As commandant of the Munich garrison of the Reichswehr, he was a central figure in putting down the attempted Beer Hall Putsch by Adolf Hitler and the Nazis in 1923.

On 28 October 1901, he was promoted Hauptmann (captain) and transferred to the Royal Bavarian 20th Infantry Regiment "Prinz Franz" (Königlich Bayerisches 20.

[3] On 7 March 1912, he was named a battalion commander in the Royal Bavarian 18th Infantry Regiment "Prinz Ludwig Ferdinand" (Königlich Bayerisches 18.

[3] With the start of World War I, Danner was sent into the field as commander of the 2nd Battalion of the 7th Bavarian Infantry Regiment, being promoted to Oberstleutnant (lieutenant colonel) on 10 September 1914.

[3] On 29 December 1914, he took command of the newly-formed Royal Bavarian 18th Reserve Infantry Regiment (Königlich Bayerisches Reserve-Infanterie-Regiment Nr.

Danner received his patent of nobility from the King of Bavaria on 20 September 1917, taking the title "Ritter von"[a].

[3][7] On 1 October 1920, Colonel Ritter von Danner took command of the Munich city garrison (Stadtkommandantur München) and was promoted to Generalmajor on 1 July 1921.

It was during this period that the Nazi Party, under the leadership of Adolf Hitler and its allies, attempted a coup d'état to overthrow the Bavarian government.