In April 1943, a battle group from the region, established at the beginning of the year, grew into the Trun partisan detachment.

In 1943 they carried out actions in the villages of Dzhinchovtsi, Strezimirovtsi, Lyalintsi, Yarlovtsi, Kashle, Gorna Melna, Zabel, Filipovtsi and Maslovishte.

[2] On September 7 of the same year, they took part in a heavy battle with government forces at the Yanicheva Chuka peak near the village of Bohova.

The 3rd Battalion remained in the original area of operation, marching to the villages of Kalna and Tsarna Trava.

They carried out actions in the villages of Dzhinchovtsi, Draintsi, Beraintsi, Radovo, Kosturintsi, Izvor, Dragoychintsi and Chepintsi.