The main fortifications for infantry consisted of 44 concrete bunkers, 23 dugouts and 26 fortified observation posts. The concrete bunkers (, redoubts) were long and narrow. The longest, Abramsskansen, was long and had room for 160 men and four machine guns, but most had room for less than 80 men—usually a rifle platoon reinforced with a machine gun section and an anti-tank section. Due to their length, their curved shapes following the mountain sides, and other characteristics, the bunkers were popularly referred to as "sausages" (). The construction of these started in 1911. Many officers still considered the fortress to have inadequate and too few fortifications for the infantry, and one officer compared the fortress to "a shoe, which is too large for the foot." One million kronor was allocated in 1915 to fix that problem, and many minor fortifications were built during the First World War.