When did Erwin Rommel join the army?

He first entered the military in 1911 at age of 20 after congratulating from cadet school. He served in both World Wars and was highly experienced leading up to his last battle. He fought first in the 6th Württemberg Infantry Regiment, but through most of the war in the Württemberg Mountain Battalion. By World War 2, he become a commander of the Führerbegleithauptquartier (Führer escort headquarters) but in France in 1940, he become a Panzer commander.