He fled Mount Athos after being accused of murdering several fellow monks and joined the nationalist band of Jovan Drimkolski in 1904–05, quickly becoming the unit's commander.

Acting alongside other former Chetnik commanders, he participated in establishing organizations whose purpose was to raise monuments to Serbian military successes from 1912–18 and to promote cultural development in Macedonia in the interwar period.

Trbić flew an airplane past German, Austro-Hungarian, and Bulgarian lines and carried out reconnaissance missions for the Serbian Army after consulting with the intelligence officer Major Milan Vasić.

In 1924, he was elected as a deputy representing the People's Radical Party (NRS) in the National Assembly of the Kingdom of Serbs, Croats and Slovenes.

[7] Alongside other former Chetnik commanders, he also participated in establishing organizations whose purpose was to raise monuments to Serbian military successes from 1912–18 and to promote cultural development in Macedonia.

[8] Following the Yugoslav coup d'état in March 1941, Trbić was overtly antagonistic towards the political and military leaders of the Kingdom of Yugoslavia, whom he blamed for the Axis invasion of the country.