After marching Self_motion his army to the west and making a dangerous crossing Motion_directional of the frozen straits in the winter of 1657/58 , he surprised Change_sentiment the unprepared Frederick III on the Danish isles and forced him into surrender Surrendering .

upon UNK 's reestablishment Recovering in the isles , the realm was again divided between him and somairle 's descendants , in a partitioning that stemmed from somairle 's coup in 1156 .