The battle of Dunnichen, also known as the battle of Nechtansmere, was fought on the 20th of May 685 AD. Of all the Dark Ages battles in Britain, it's probably one that have been the better reported, notably by the english monk Bede.
In 685 AD, most of the northern briton kingdoms have fallen to the growing power of the Angles of Deira and Bernicia, now united in the kingdom of Northumbria. The Gododdin had fall around 638 AD, and the Northumbrians were enough strong to control southern pictland and Dal Riada, after having defeated the Picts and even send an expedition in Ireland to size slaves.
But a new power rose in Pictland. Bridei III was the son of Beli, the king of Alcluyd, and grandson of the king Nechtan of the Picts. He rose to the kingship of Fortriu, and after several successful campaigns he was able to control most of Pictland and became a threat for the Northumbrian power.
Ecgfrith, the Northumbrian king, decided to invade Pictland with a strong force to stop Pictish raids in his own kingdom. The two armies met near Dunnichen, in Angus. Bridei divided his armie in two halfs, the smaller was waiting the Northumbrian army near a swamp, and the bigger part was hiding on the Dunnichen hills.
When the Northumbrians were enough close, the smaller part of the Pictish army feigned retreat and run. This was the moment Bridei was waiting to attack with the other part of the army. The Northumbrians, trapped in the marsh, were slaughtered, their king slain and survivors enslaved. The Picts, and their allies from Alcluyd and Dal Riada, were totally victorious.
This victory was decisive for the future of Scotland, and it has been argued that Scotland may have never existed in case of a Northumbrian victory at Dunnichen. It definatly free the Picts, the Dal Riadans and the Britons of Alcluyd of the anglian power, as a preparation for their future union.
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