I suspect they knew very well that the core group beating them to death were the local Skolt, Inari and other Eastern Sa'ami who'd contributed something like 5,000 soldiers to the Finnish army.
When you fight a war in the winter in the far North it's wise to have people around you who can tolerate the cold.
Remember the guy who was diving into the Arctic and swimming a quarter mile a few weeks back? He thinks he trained himself to withstand the cold. Many others know you don't "train" for that ~ you just do it 'cause you can.