In mid 1944, the German authorities began to build a defence line on the borders of Kozy, Lipnik and Hałcnów, to stop the approaching Soviet Army. The so-called B2 line (B2- Stellung) consisted of bunkers (concrete multi-person defence posts), kochbunkers (concrete one-man shooting posts), trenches (fortified ditches used for the movement of soldiers) and anti-tank ditches. The groundwork on the line was carried out using the forced labour of mainly women and teenagers from the surrounding areas, as well as from Wadowice and Sucha Beskidzka. The workers received no payment. At least seven kochbunkers from that period have survived to the present day in the area of Małe Kozy, three of them in the forests of the Beskid Mały. The kochbunkers were prefabricated concrete elements, brought to the site and placed in deep purpose-built  pits. There was an entrance on the ground level and gun slots in the upper part on the opposite side. Each kochbunker was covered with earth on the outside; inside, there was just enough room for one soldier with a hand machine gun. The bunker protected the gunner from the impact of large calibre bullets and shrapnel. Line B2 was in use in January and February 1945, when the Soviet Army was approaching Bielsko and Biała. Numerous traces of the fortifications have survived to the present day.