Doumbiotis took part with Karatasos and other Macedonian chieftains in many battles in south and central Greece, like in Skiathos in 1823, in the Battle of Neokastron at Pylos in 1825, in the protection of Hydra (1824–25), in Trikeri in 1823 and 1827, in Atalanti in 1827, in Vrysakia in 1822, in Arachova in 1832 and in Thebes. During Greek civil wars of 1824–1825 he fought with Ioannis Kolettis' army in the Peloponnese. In March 1825 on Kolettis' proposal he was promoted to General officer. For some time, between 1826–28, according to accusations attributed to him, he acted as a pirate. He was imprisoned by Kapodistrias in Aegina in 1828–28. From 1822 until 1828 he resided in Glossa, Skopelos, where for some time he served as governor ("politarches"). His autocratic and peremptory behaviour led the local residents to request his dismissal in 1826.