In the early stages of the Great War, the heights of the Kolovrat Plateau were occupied by the Italian Army, as this was deemed a strategic location along the front: from here, in fact, you could control enemy positions, movements and rear lines across the Isonzo Valley. The Army built three defensive front lines to make this post safe and also effective against potential attacks.
The most advanced lines lie now in Slovenian territory and are not clearly visible: the first one wound along the positions taken after the first operations of 1915 and was a rather weak entrenchment (reinforced later but always vulnerable). The second, also known as hard defensive line, had been fortified in different sections, including permanent heavy weaponry.
On Mt. Klabuk instead, visitors can admire the remnants of the third defensive line, the most backward and fortified. The terrain here is still marked by the remains of trenches and machine-gun pits, howitzers and guns pointed against the Austro-Hungarian front line and the supply line connecting Tolmin to the Bača Valley. Still visible are some observation posts, that have been perfectly restored thanks to the work of the Foundation "Poti miru v Posočju" of Caporetto, which rebuilt the Great War structures using materials of the same period.
This mount featured also several command posts, a multi-level network of tunnels excavated in the rock and an extensive entrenched system connecting both sides of the border. Equally interesting is a spiral staircase connecting a fortified position with an underground tunnel.
