The forces for the breakout attempt from Tobruk on 20 November 1941

The forces for the breakout attempt from Tobruk were the 32nd Army Tank Brigade and the 14th Infantry Brigade, with supporting artillery:

32nd Army Tank Brigade   Brigadier Willison
 C Squadron, The King's Dragoon Guards
 1st RTR
 4th RTR
 D Squadron, 7th RTR

14th Infantry Brigade (part) Brigadier Chappel
 2nd York and Lancaster Regiment
 2nd Black Watch

16th Infantry Brigade  Brigadier Lomax
 The 2nd King's Own

Supporting Artillery
 1st Regiment RHA
 104th Regiment RHA
 107th Regiment RHA
 144th Field Regiment RA

Engineers
 2nd Field Company RE
 54th Field Company RE

This is drawn from Note 2 on page 43 of Vol.III of the Official History--The Mediterranean van Middle East (September 1941 to September 1942): British Fortunes Reach Their Lowest Ebb (1960).