By 1920, the army of Norway was a national militia. Service was universal and compulsory, liability commencing at the age of 18 and continuing till the age of 56. The men were called out at 21, and for the first 12 years belonged to the line ; then for 12 years to the landvarn. Afterwards they passed into the landatorm, in which they remained until they attained the age of 55 years. The initial training was carried out in recruits' schools ; it lasted for 48 days in the infantry and garrison artillery, 62 in the mountain batteries, 72 in the engineers, 92 in the field artillery, and 102 in the cavalry. As soon as their courses were finished the men were transferred to the units to which they would permanently belong, and with them went through a further training of 30 days. Subsequent training consisted of 80 days in the second, third and seventh years of service.