Together, we are the United Nations
Gunulfr ok Øgotr ok Aslakr ok Rolfr resþu sten þænsi æftir Ful, felaga sin, ær warþ ... døþr, þa kunungar barþusk.
The Surprise CC says:
CP defenders may SR 1 or 2 TU/TU-A Divisions to combat space (may not overstack; must trace route by land or come from Res Box). Does not count as SR.
I note that the card text says may SR. Can CP play Surprise when the defending stack is 3 units, just to cull his deck?