Around the top of the hill Monte Sei Busi, a section of the so-called Italian Entrenchment (Trincerone italiano) can be seen, a large fortified line of defence which started at Monte San Michele/Debela griža and reached all to Cave di Selz/Selce, Doberdò del Lago/Doberdob and Monfalcone/Tržič. It is also known under the name of Trincea Mazzoldi. It was constructed on the basis of a trench that had been dug by Austro-Hungarian troops when they had still held this area. In 1916–1917, the Italian Army fortified it with concrete and thus provided for effective defence in the case of Austro-Hungarian counter-offensive. After the Twelfth Isonzo Battle the entrenchment was of no use. Because of the Austro-Hungarian attack in the Upper Soča Region and their advance to the Friuli lowlands, the Third Italian Army had to leave the entrenchment immediately, since it was the only way to avoid being besieged.
Pass the charnel house of Redipuglia/Redipulja and head towards Ronchi dei Legionari (Via Terza Armata, SR 305); turn left to Via del Carso. After crossing the rails, keep to the right until you reach a small parking lot next to the outdoor museum Dolina del XV Bersaglieri. After visiting the outdoor museum, continue along the macadam road. Soon you will catch sight on the right of the fortified positions, scattered throughout the Monte Sei Busi area.