1st Commando Brigade were placed under command of the 7th Armoured Div (British 12 Corps). They were tasked with clearing the enemy from an area between the railroad to Roermond and the Meuse river, and securing the villages of Maasbracht, Brachterbeek and Linne.
The National Archives hold the following records regarding this operation.
DEFE 2/95 Combined Operations Headquarters: "Baboon" "Copyright" "Blackcock" "Bruteforce" "Barbaric" and "Bristle" Date: 1941-1945
WO 205/846 21st Army Group Operational reports: Operation Blackcock Date: 1945 Jan
WO 205/847 Operation Blackcock: working papers Date: 1945 Jan.
WO 205/848 Operation Blackcock: 7 Army Division Date: 1945 Jan.
WO 205/849 Operation Blackcock: 52 Division Date: 1945 Jan
WO 351/60 21 Army Group: Operation "BLACKCOCK"; clearing the area between the River Maas and the River Roer 15-26 January 1945 Note: With maps Date: 1945 Jan 01 - 1945 Dec 31.