Editing Operation Compass (section)

=== Western Desert Force ===
Western Desert Force, 9 December 1940 Details taken from Christie (1999) and Montanari (1990) unless specified.{{sfn|Christie|1999|pp=65, 68–78, 82, 104}}{{sfn|Montanari|1990|pp=203–204}}
* Commander-in-Chief, Middle East (General Sir [[Archibald Wavell]])
* [[Western Desert Force]] (Lieutenant-General [[Richard O'Connor]])
** 1st Battalion, [[Royal Sussex Regiment|Royal Sussex]] (7th Indian Infantry Brigade battalion)
** 4th Battalion, 11th Sikh Regiment (7th Indian Infantry Brigade battalion)
** [[7th Royal Tank Regiment]] (Until 11 December, then 6th Australian Division)
** 2nd Heavy Anti-Aircraft Regiment Royal Artillery
** 7th Heavy Field Regiment [[Royal Artillery]]
** [[104th (Essex Yeomanry) Regiment, Royal Horse Artillery]]
** 6 × light anti-aircraft batteries
** [[7th Armoured Division (United Kingdom)|7th Armoured Division]] (Major General [[Michael O'Moore Creagh]])
*** [[4th Armoured Brigade (United Kingdom)|4th Armoured Brigade]] (Brigadier J. A. L. Caunter)
**** [[7th Queen's Own Hussars]] (−1 troop)
**** [[2nd Royal Tank Regiment]]
**** [[6th Royal Tank Regiment]]
*** [[7th Armoured Brigade (United Kingdom)|7th Armoured Brigade]] (Brigadier Hugh E. Russell)
**** [[3rd The King's Own Hussars]]
**** [[8th King's Royal Irish Hussars]]
**** [[1st Royal Tank Regiment]]
*** [[7th Support Group (United Kingdom)|Support Group]] (Infantry Brigade) (Brigadier [[William Gott]])
**** 1st Battalion [[King's Royal Rifle Corps]]
**** 2nd Battalion [[Rifle Brigade]]
**** [[1st Regiment Royal Horse Artillery]]
**** [[4th Regiment Royal Horse Artillery]]
*** [[11th Hussars (Prince Albert's Own)]] (Reconnaissance)
*** [[3rd Regiment Royal Horse Artillery]]
*** [[106th (Lancashire Yeomanry) Regiment, Royal Horse Artillery]] (2 × anti-tank batteries, 2 × anti-aircraft batteries)
*** 2nd (Cheshire) Field Squadron [[Royal Engineers]]
*** 141st Field Park Royal Engineers
*** 2 × [[Royal Air Force Regiment]] armoured car companies
** [[4th Indian Division]] (Major General [[Noel Beresford-Peirse]], until 11 December)
*** [[5th Indian Infantry Brigade]] (Brigadier [[Wilfrid Lewis Lloyd]])
**** 1st Battalion, [[Royal Fusiliers]]
**** 3rd Battalion, [[1st Punjab Regiment]]
**** 4th Battalion, [[6th Rajputana Rifles]]
**** 1× anti-tank company
*** [[11th Indian Infantry Brigade]] (Brigadier [[Reginald Savory]])
**** 1st Battalion, [[6th Rajputana Rifles]]
**** 2nd Battalion, [[Queen's Own Cameron Highlanders]]
**** 4th Battalion, [[7th Rajput Regiment]]
**** 1 × anti-tank company
*** [[16th Infantry Brigade (United Kingdom)|16th British Infantry Brigade]] (Brigadier [[Cyril Lomax]], until 11 December)
**** 2nd Battalion, [[Queen's Regiment]]
**** 1st Battalion, [[Argyll & Sutherland Highlanders]]
**** 2nd Battalion, [[Leicestershire Regiment]]
*** [[Central India Horse (21st King George V's Own Horse)]] (Reconnaissance)
*** 1st Battalion, [[Northumberland Fusiliers]] (machine gunners, 1 × company)
*** 1st Field Regiment Royal Artillery
*** 25th Field Regiment Royal Artillery
*** 31st Field Regiment Royal Artillery
*** 4th Field Squadron Royal Engineers
*** 12th Field Squadron Royal Engineers
*** 18th Field Squadron Royal Engineers
*** 21st Field Squadron Royal Engineers
*** 11th Field Park Royal Engineers
** [[7th Indian Infantry Brigade]] (Brigadier [[Harold Rawdon Briggs|Harold Briggs]], [[Mersa Matruh]] garrison, two battalions detached, until 11 December)
*** 2nd Battalion, [[11th Sikh Regiment]] (detached from)
** [[Selby Force]] (Brigadier Arthur Selby)
*** 3rd Battalion, [[Coldstream Guards]]
*** 1 × company [[Northumberland Fusiliers]] (Machine Gunners)
*** 1 × company, 1st Battalion, [[South Staffordshire Regiment]]
*** 1 × company, 1st Battalion, [[Cheshire Regiment]]
*** 1 × platoon, 1st Battalion [[Durham Light Infantry]]
*** 1 × troop, [[7th Queen's Own Hussars]]
*** 1 × section, 8th Field Regiment Royal Artillery
*** 1 × section, [[107th (South Nottinghamshire Hussars) Regiment, Royal Horse Artillery]]
** [[6th Australian Division]] (Major General [[Iven Mackay]], from 11 December)
*** [[16th Australian Infantry Brigade]] (Brigadier [[Arthur Allen (general)|Arthur Allen]])
**** [[2/1st Battalion (Australia)|2/1st Australian Battalion]]
**** [[2/2nd Battalion (Australia)|2/2nd Australian Battalion]]
**** [[2/3rd Battalion (Australia)|2/3rd Australian Battalion]]
*** [[17th Australian Infantry Brigade]] (Brigadier [[Stanley Savige]])
**** [[2/5th Battalion (Australia)|2/5th Australian Battalion]]
**** [[2/6th Battalion (Australia)|2/6th Australian Battalion]]
**** [[2/7th Battalion (Australia)|2/7th Australian Battalion]]
*** [[19th Australian Infantry Brigade]] (Brigadier [[Horace Robertson]])
**** [[2/4th Battalion (Australia)|2/4th Australian Battalion]]
**** [[2/8th Battalion (Australia)|2/8th Australian Battalion]]
**** [[2/11th Battalion (Australia)|2/11th Australian Battalion]]
*** [[2/6th Cavalry Commando Regiment (Australia)|6th Division Reconnaissance Regiment]] (Reconnaissance)
*** [[2/1st Field Regiment (Australia)|2/1st Field Regiment]]
*** [[2/2nd Field Regiment (Australia)|2/2nd Field Regiment]]
*** [[2/3rd Field Regiment]]
*** 2/1st Field Company, Royal Australian Engineers
*** 2/2nd Field Company, Royal Australian Engineers
*** 2/3rd Field Company, Royal Australian Engineers

The Western Desert Force consisted of about 31,000 soldiers, 120 guns, 275 tanks and sixty armoured cars. The 4th Indian Division was exchanged with the 6th Australian Division for the pursuit after the first part of Operation Compass.{{sfn|Christie|1999|p=86}}