That same year he became the head of the Franciscan Province of the Assumption of the Blessed Virgin Mary and moved to Mostar.

In 1920, he was elected to the Constitutional Assembly of the Kingdom of Serbs, Croats and Slovenes as a member of the Croatian Popular Party.

World War I brought Brotnjo, just as it did all other regions, great suffering - poverty, hunger, illness and death.

During the war, children from poor families were sent to these parts for rest and nutrition with the help of various humanitarian organizations and associations.

The members of the District branch of the "Croatian National Community" (HNZ) played a significant role in this respect.