Operation Blackcock was a World War II operation to clear German troops from the Roer Triangle, formed by the towns of Roermond and Sittard in the Netherlands and Heinsberg in Germany. It was conducted by the British Second Army between 14 and 26 January 1945. The objective was to drive the German 15th Army back across the Rivers Rur and Wurm and move the frontline further into Germany. The operation was carried out under the command of XII Corps by three divisions: the 7th Armoured Division (better known as the "Desert Rats"), the 52nd (Lowland) and the 43rd (Wessex) ("Wessex Wyverns") Infantry Divisions.