The Annales Fuldenses report that there were so many dead Northmen that their bodies blocked the run of the river. After this victory Arnulf built a castle on an island in the Dijle river.
According to the Annales Fuldenses, the sheer number of slain Northmen caused their bodies to block the river's path.  Following this triumph, Arnulf built a fortress on an island within the Dijle River.