Ockley's name initially appears to fit the uncertain site where battle took place described in the entry for the year 851 of the "Anglo-Saxon Chronicle". According to the chronicler, king Æthelwulf and his son Æthelbald, together with the West-Saxon army, fought against an invading Danish army of 350 ships that had plundered London and Canterbury previously, and had also put king Beorhtwulf of Mercia to flight. The chronicler refers to the battlefield as Aclea, Oak Lea, and the Danish army was defeated suffering “the greatest slaughter… we have heard tell of up to this present day”. However, Aclea almost always appears in modern English as Oakley not Ockley and the identification of Ockley with the battlefield is made virtually impossible.