Новгородская первая летопись
The existence of the battle is only known from Russian sources. The first source to mention the battle is the Novgorod First Chronicle from the 14th century. According to the chronicle, on receiving the news of the advancing Swedish, Norwegian, Finnish and Tavastian fleets, the 20-year-old Prince Alexander Yaroslavich of Novgorod quickly moved his small army and local men to face the enemy before they had reached Lake Ladoga. The chronicle described the battle as follows: