After the war's end, he was promoted to lieutenant colonel on 25 September 1913, and made commander of the 26th Infantry Regiment, then based in his native district of Delvino and Himara.[2]
During the Balkan Wars, the Hellenic Army had occupied the region of Northern Epirus, and Doulis was appointed military commander of Argyrokastro. In December 1913 however, with the Protocol of Florence, the Great Powers decided to award the region to the newly formed Albanian state. This decision was highly unpopular among the local Greek population, who decided to form their own government and military in order to secure their autonomy. Doulis resigned his commission in the Hellenic Army and joined the autonomists.[4]
With the official declaration of the Autonomous Republic of Northern Epirus, on 18 February 1914, he was appointed to the post of Minister of Military Affairs and head of the army of the new government.[2] From the first days he managed to mobilize an army consisting of more than 5,000 volunteer troops, and organize local gendarmerie units (called "Sacred Bands") in order to secure the region. Until May 17 (New Style), when the Protocol of Corfu was signed, the autonomist Epirote forces managed retain their positions and push back the attacks of Albanian irregulars and gendarmerie, which was under the command of Dutch officers.[5]
When World War I broke out, the Greek forces, after approval from the Triple Entente Powers, re-entered Northern Epirus. In the subsequent legislative elections, Dimitrios Doulis was elected as member of the Greek parliament for the Argyrokastron Prefecture.[6] On 25 April 1915, he was promoted to colonel,[2] and retired from the army a few days after.
He died in Athens on 5 April 1928.[2][1]