The Poem The Battle of Maldon
The poem was written near the time of the historical battle itself, probably by a monastic scribe. It comes to us as a fragment, primarily with a missing ending. At the time of battle, English royal policy of responding to Norse incursions was split. Some favored paying off, in land and wealth, the Viking invaders, while others favored fighting to the last man. Recent scholarship suggests that Byrhtnoth held this latter attitude, generally favored by the ecclesiastic party.
The Vikings sailed up the Blackwater, and Byrhtnoth called out his levy. The poem begins with his teaching his men (who would have been peasants and householders from the area) how to stand and how to hold weapons. The Vikings sailed up to a small island in the river. At ebb, the river leaves a land bridge from this island to the shore, the description of which seems to have matched the Northey Island causeway at that time. This would place the site of the battle about two miles southeast of Maldon. Olaf addressed the Saxons, promising to sail away if he was paid with gold and armor from the lord. Byrhtnoth refused.
Olaf's forces could not make headway against the troops guarding the small land bridge, and he asked Byrhtnoth to allow his warriors onto the shore. Byrhtnoth, in a moment of "ofermode," allowed the full complement of Norse onto shore for the battle. The Vikings made short work of the Saxons, killing Byrhtnoth early in the battle, after which many Saxons fled.
There is some discussion about the meaning of "ofermode." Most basically, it means "over heart," and it could mean either "pride" or "excess of courage." One argument is that the poem was written to celebrate Byrhtnoth's actions and goad others into heroic action, and Byrhtnoth's action is out of "heroic spirit." Another argument is that the poem is an elegy on a terrible loss and that the monastic author pinpoints the cause of the defeat in the commander's sin of pride.
Had Byrhtnoth's forces kept the Vikings off by guarding the bridge, it is likely that Olaf would have sailed farther up the river or along the coast, and taken another target. As a man with troops and with weapons, it might be that Byrhtnoth had to allow the Vikings ashore to protect others. Had the Anglo-Saxons paid off the Vikings, the latter would likely have gone on to other targets.