Unknown; the sources record no details of the size or composition of the Viking raiding force or any Mercian defensive force.
Beorhtwulf was King of Mercia, a kingdom of Anglo-Saxon England, from 839 or 840 to 852. His ancestry is unknown, though he may have been connected to Beornwulf, who ruled Mercia in the 820s. Almost no coins were issued by Beorhtwulf's predecessor, Wiglaf, but a Mercian coinage was restarted by Beorhtwulf early in his reign, initially with strong similarities to the coins of Æthelwulf of Wessex, and later with independent designs. The Vikings attacked within a year or two of Beorhtwulf's accession: the province of Lindsey was raided in 841, and London, a key centre of Mercian commerce, was attacked the following year. Another Viking assault on London in 851 "put Beorhtwulf to flight", according to the Anglo-Saxon Chronicle; the Vikings were subsequently defeated by Æthelwulf. This raid may have had a significant economic impact on Mercia, as London coinage is much reduced after 851.
Berkshire appears to have passed from Mercian to West Saxon control during Beorhtwulf's reign. The Welsh are recorded to have rebelled against Beorhtwulf's successor, Burgred, shortly after Beorhtwulf's death, suggesting that Beorhtwulf had been their overlord. Charters from Beorthwulf's reign show a strained relationship with the church, as Beorhtwulf seized land and subsequently returned it.
Beorhtwulf and his wife, Sæthryth, may have had two sons, Beorhtfrith and Beorhtric. Beorhtric is known from witnessing his father's charters, but he ceased to do so before the end of Beorhtwulf's reign. Beorhtfrith appears in later sources which describe his murder of Wigstan, the grandson of Wiglaf, in a dispute over Beorhtfrith's plan to marry Wigstan's widowed mother Ælfflæd. Beorhtwulf's death is not recorded in any surviving sources, but it is thought that he died in 852.
For most of the 8th century, Mercia was the dominant Anglo-Saxon kingdom. Mercian influence in the south-eastern kingdoms of Kent, East Anglia, and Essex continued into the early 820s under Coenwulf of Mercia. However, Coenwulf's death in 821 marked the beginning of a period in which Mercia suffered from dynastic conflicts and military defeats that redrew the political map of England. Four (possibly five) kings, from what appear to be four different kin-groups, ruled Mercia throughout the next six years. Little genealogical information about these kings has survived, but since Anglo-Saxon names often included initial elements common to most or all members of a family, historians have suggested that kin-groups in this period can be reconstructed on the basis of the similarity of their names. Three competing kin-groups are recognizable in the charters and regnal lists of the time: the C, Wig and B groups. The C group, which included the brothers Coenwulf, Cuthred of Kent, and Ceolwulf I, was dominant in the period following the deaths of Offa of Mercia and his son Ecgfrith in 796. Ceolwulf was deposed in 823 by Beornwulf, perhaps the first of the B group, who was killed fighting against the East Anglians in 826. He was followed by Ludeca, not obviously linked to any of the three groups, who was killed in battle the following year. After Ludeca's death, the first of the Wig family came to power: Wiglaf, who died in 839 or 840. Beorhtwulf, who succeeded to the throne that year, is likely to have come from the B group, which may also have included the ill-fated Beornred who "held [power] a little while and unhappily" after the murder of King Æthelbald in 757.
The site of Viking Raid on Lindsey lies on West Walton Formation, Ampthill Clay Formation And Kimmeridge Clay Formation (Undifferentiated), bedrock that formed in the Kimmeridgian. The rock here is mudstone, siltstone and sandstone.
The raid on Lindsey in 841 struck within a year or two of Beorhtwulf's accession as King of Mercia, and was swiftly followed in 842 by a Viking attack on London, a key centre of Mercian commerce, suggesting that the raiders were pressing hard against the kingdom's most vulnerable and valuable territories in rapid succession.
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