Food was rationed all over Norway during the war and food stamps were given out, but due to their self-reliant nature, most sami were never short on food. There was some level of trade and cooperation with the germans, and some sami would trade their food stamps with people living in the towns for other commodities.
Few sami took part in any fighting, but there were a few who became partisans, fighting guerilla warfare against the germans along with other norwegian guerilla fighters in the north. Many were suspected to be communists after the war, or even soviet spies.
Many reindeer herding sami took part in guiding people across the border to Sweden, people who wanted to flee german-occupied Norway.
When the war was turning against the germans, they issued a retreat from Finnmark and Lappland, using scorched earth tactics and forcibly evacuating every civilian from Finnmark and burning every building, removing every visible trace of sami culture in Finnmark and northern Finland.
Many were sent to Troms and even further south. This experience was both traumatising for the population and changed the demographics of the region to an extent, with many people choosing to not return. There were however a considerable number of people who managed to stay behind, hiding in the mountains.