The Italian Army occupied Bela krajina in the first days of May 1941 and captured Metlika, Črnomelj and Semič. They also took control of the settlements along the border Kolpa River, which were occupied by units of the Border Fascist Militia and the Royal Financial Guard.
Due to partisan resistance, the Italian occupier abandoned some of its posts and in the first half of 1942 fortified others with bunkers and trenches and enclosed the areas around its posts either fully or partially by barbed wire. The most fortified towns were: Metlika with 21 bunkers, Črnomelj with 64 bunkers and Semič with 11 bunkers. All those towns were entirely surrounded with barbed wire, which prevented people from passing through.
Partisan informants collected as accurate information as possible about the enemy posts, forts and bunkers along the railway line in Bela krajina. They reported the number of soldiers, the units (»Royal Army, Financial Guard, Fascists, Carabinieri, Railway Militia, the White Guard«), the type of fortified buildings (bunkers, barbed wire), the type of armament, the movements of units away from their posts, and their supply. The intelligence service was performed by informants of the partisan units that were either permanently or temporarily active in Bela krajina. Civilians and ground activist also helped to gather information.