Access: From the village of Kal-Koritnica, that lies 3 km from Bovec in the direction towards the Trenta valley. The car can be parked on the parking site by the main road, and from here walking follows. In the initial part, the track to the hill of Svinjak is to be followed. After about 25 minutes of walk, the track running to Čelo forks to the left and after some tens of meters reaches the fortified gun positions. Access to the positions is of medium difficulty.

Time required for visit : 2 hours

Historical outline: The Austro-Hungarian fort lies on the slope of Mt. Svinjak, which rises with its altitude of 1653 m above the Bovec basin. The site with the fort is called Čelo by the locals, while the Austro-Hungarian army gave the name of Stützpunkt Kal to the fort during the war. It acted as part of the Bovec blockade (Sperre Flitsch) that served as the defence against Italian attacks. The Austrians started its construction in November 1914 and completed it just before the war on the Isonzo Front began, in the spring of 1915, when they also built in it two 12-cm guns M.80. The transportation of the guns to these positions was a very demanding task, because each gun weighed more than 6 tons. The fort played an important role in the defence of the valley section of the battlefield in the Bovec basin, since it was possible to shell the roads towards Kluže and to the Trenta valley from the fort. Due to continuous shelling by the Itallian artillery the fort was damaged at several places. Its squad was forced to abandon it and fortify their positions somewhat lower, under the bottom right section of the fort, where a large cave was made for the two guns. In the history of battles in the Bovec basin these two guns are recorded as the Kal Battery (Batterie Kal). Before the Austro-Hungarian-German breakthrough in the Bovec basin in the 12th Isonzo battle, a tremendous artillery introduction was performed in the night hours of 24th October 1917, in which the guns from the positions at Čelo also took part. Besides the gunnery, there was also a battalion of German engineers with mine mortars from which mines, filled with poisonous gases, were launched. Most of the gas shells and gas mines were aimed at Italian positions in a little valley called Naklo, along which the road from Bovec to Čezsoča runs. In this section, gas suffocated from 500 to 600 Italian soldiers, almost the whole of the 3rd battalion of the 87th infantry regiment of the Friuli brigade. The Austro-Hungarian infantry had a free way for its further advance towards Žaga and Mt. Stol.

Present situation: Arranged on the slope of Svinjak is an outdoor museum. The Austro-Hungarian fort at Čelo is located on the slope with an exceptional panoramic view over the Bovec basin, Mt. Rombon and other surrounding mountains. It has been quite well preserved until today. No major reconstruction works have been done here, the site was only cleaned and arranged. The main part of the fort consists of a 200-metre long trench with built walls connecting the two gun positions with a kitchen, an observation post, two dwelling structures for 40 men and a shelter for 20 soldiers. The trench had altogether 150 loopholes for riflemen.

In charge of the reconstruction and maintenance of the Austro-Hungarian positions at Čelo is the Society Dreizehn-Dreizehn (13–13) of Bovec, in collaboration with the Ustanova »Fundacija Poti miru v Posočju« (»Walks of Peace in the Soča Region Foundation«).