In the sea battles of medieval Scandinavia, the side with the largest and highest ships would usually have an advantage, since this meant the crew could attack the enemy from above with projectiles and other weapons. Sverre built the largest ship afloat at the time, the "Mariasuda". Because of its great size, the seaworthiness of the "Mariasuda" was rather poor and it would only be useful within the narrow fjords. Either because of luck or good strategy such a situation would soon arise.