A decisive 851 West Saxon victory over Danish Vikings, described in the Anglo-Saxon Chronicle as the greatest slaughter of a Viking force heard of to that date.
Key Facts
- Year
- 851
- Viking fleet size
- 350 ships ships
- West Saxon commander
- King Æthelwulf of Wessex
- West Saxon co-commander
- Æthelbald, son of Æthelwulf
- Probable location
- Ockley or Oakley, Surrey/Hampshire
- Meaning of Aclea
- Oak Field (per Asser)
Location
Cause → Event → Consequence
A Danish Viking force of roughly 350 ships sailed into the Thames estuary, sacking Canterbury and London and routing Beorhtwulf, King of Mercia. The Vikings then crossed the Thames southward into Surrey, bringing them into direct conflict with the West Saxon kingdom under Æthelwulf.
King Æthelwulf and his son Æthelbald led the West Saxon army against the Danish force at Aclea, a location recorded in Surrey but whose precise site—possibly Ockley in Surrey or Oakley in Hampshire—remains unidentified. The Anglo-Saxon Chronicle records the battle as producing the greatest slaughter of a Viking raiding army known up to that time.
The West Saxons secured a decisive victory, halting the Viking advance through southern England. The battle demonstrated that large Viking fleets could be defeated in open battle, and it reinforced Wessex's military standing among the Anglo-Saxon kingdoms at a time of intensifying Scandinavian raids.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Æthelwulf, King of Wessex, Æthelbald (son of Æthelwulf).
Side B
1 belligerent