On 14th of August 1288 there was a great battle between the Archbishop of Cologne and the Duke of Limburg against the Duke of Brabant and the Count of Berg. The Duke of Brabant won and the Archbishop of Cologne became a prisoner of the Count of Berg. So he could not do anything against Düsseldorf getting the status of a city. So Düsseldorf became a city with full City Rights in 1288.