White wolves are one of the basic ice units that can be made in the special barracks, called "the ice tower".
They are cheap as a rock in terms of gold, but in terms of honor they cost a little bit more than the cerberus from the evil faction, that is comparable to the white wolf in terms of ability and general usage.
The wolves can easily killed. However, they can be hard to deal with in large masses. They can be used to distract, ambush, pick off other weak units and break siege engines by surprise.
Furthermore ... Due to their super good agility, they are perfect to be used to capture the estates, giving you massive advantage, in case you are able to hold on the estates you conquered, especially in the beginning.