Henry of Huntingdon

The chronicle of Henry of Huntingdon. 

Comprising the history of England, from the invasion of Julius Cæsar to the accession of Henry II. Also, The acts of Stephen, king of England and duke of Normandy
by Henry of Huntingdon, 1084?-1155; 

Forester, Thomas. ed. and tr
Publication date 1853
https://archive.org/details/chroniclehenryh00foregoog/page/n247/mode/2up

page 209

Fulford

Then they [Tostig and Haraldr] joined their forces and came up the Humber, as far as York, near which they were encountered by the Earls Edwin and Morcar ; the place where the battle was fought is still shown on the south side of the city. Here Harold, king of Norway, and Tosti, his ally, gained the day. 

 Stamford Bridge

When this intelligence reached Harold, king of England, he advanced with a powerful army, and came up with the invaders at Stanford Bridge. The battle was desperately fought, the armies being engaged from daybreak to noonday, when, after fierce attacks on both sides, the Norwegians were forced to give way before the superior numbers of the English, but retreated in good order. Being driven across the river, the living trampling on the corpses of the slain, they resolutely made a fresh stand. 

Here a single Norwegian, whose name ought to have been preserved, took post on a bridge, and hewing down more than forty of the English with a battle- axe, his country's weapon, stayed the advance of the whole English army till the ninth hour. At last some one came under the bridge in a boat, and thrust a spear into him, through the chinks of the flooring. The English having gained a passage, King Harold and Tosti were slain ; and their whole army were either slaughtered, or, being taken prisoners, were burnt.