The Battle of Detern on 27 September 1426 marked the prelude to the East Frisia

East Frisia

East Frisia or Eastern Friesland is a coastal region in the northwest of the German federal state of Lower Saxony....

n rebellion against the rule of the tom Brok

Tom Brok

The tom Brok family were a powerful East Frisian line of chieftains, originally from the Norderland on the North Sea coast of Germany. From the second half of the 14th century, the tom Broks tried to gain control of East Frisia over the other chieftain families...

 family over East Frisia.

In the course of the battle an East Frisian peasant army under Focko Ukena

Focko Ukena

Focko Ukena was an East Frisian chieftain who played an important part in the struggle between the Vetkopers and Schieringers in the provinces of Groningen and Friesland...

 and Sibet of Rüstringen defeated the Oldenburg troops called by Chieftain Ocko II tom Brok

Ocko II tom Brok

After the early death of his father, Ocko II tom Brok was Chieftain of the Brokmerland and the Auricherland in East Frisia ....

 to assist him, the Archbishop of Bremen and the counts of Hoya

Hoya

Hoya is a genus of 200-300 species of tropical plants in the family Apocynaceae , fomerly considered to be in the Asclepiadaceae...

, Diepholz

Diepholz

Diepholz is a town and capital of the district of Diepholz, in Lower Saxony, Germany. It is situated on the river Hunte, approximately 45 km northeast of Osnabrück, and 60 km southwest of Bremen....

 and Tecklenburg

Tecklenburg

Tecklenburg is a town in the district of Steinfurt, in North Rhine-Westphalia, Germany.-Geography:It is located at the foothills of the Teutoburg Forest, southwest of Osnabrück.-Division of the town:...

, who had besieged Detern

Detern

Detern is a municipality in the district of Leer, in Lower Saxony, Germany.The Battle of Detern was fought here in 1426....

. Focko Ukena - a former henchman

Henchman

Henchman referred originally to one who attended on a horse for his employer, that is, a horse groom. Hence, like constable and marshal, also originally stable staff, henchman became the title of a subordinate official in a royal court or noble household...

 of Ocko - thrashed the combined Bremen-Oldenburg cavalry force, after Count Dietrich of Oldenburg

Dietrich of Oldenburg

Derrick or Dietrich of Oldenburg, Latin-based anglicization also Theoderic of Oldenburg , nicknamed Theoderic the Lucky or the Fortunate , was a feudal lord in northern Germany, holding the counties of Delmenhorst and Oldenburg...

 deserted his allies during the battle. Count Johann von Rietberg, the second son of Otto II of Rietberg and Conrad X of Diepholz fell in battle. and Archbishop Nicholas of Oldenburg-Delmenhorst was captured., but was released after negotiations with the Bremen town council.