Operation Compass

After advancing into Egypt, the Italian Tenth Army stopped around Sidi Barrani and built a chain of fortified camps from Maktila on the coast to the inland positions around Tummar, Nibeiwa, Rabia and Sofafi. The camps were separated by open desert. British reconnaissance identified a gap between Nibeiwa and Rabia wide enough for the main striking force to pass through unseen and approach Nibeiwa from the west.

Beyond the frontier, Bardia and Tobruk were defended ports on the coast road. Farther west the Jebel Akhdar pushed the Via Balbia around the northern edge of Cyrenaica, while rough interior tracks ran through Mechili, Msus and Antelat. Those tracks gave the mobile British force a shorter route toward the coast south of Benghazi.

Combe Force reached the Via Balbia near Sidi Saleh before the leading Italian columns escaping from Benghazi. The roadblock placed the retreating Tenth Army between the coast, British armour coming from the east and Australian formations following around the Jebel. Geography converted a pursuit into an encirclement.

Archibald Wavell authorised Compass with supplies for a short operation. Richard O'Connor concentrated the opening attack through the Nibeiwa–Rabia gap and used the 4th Indian Division with Matilda tanks to break the central camps in sequence. The plan depended on surprise, local concentration and concealed forward supply dumps that reduced the distance fuel, water and ammunition had to travel once the attack began.

The collapse around Sidi Barrani changed the decision. O'Connor continued toward the frontier, then Bardia and Tobruk as captured transport and newly available ports extended the force's reach. Workshops and recovery units became operational assets: every repaired cruiser tank and every captured lorry increased the mobile strength available for the next move.

The final decision came when reconnaissance showed the Tenth Army withdrawing from Cyrenaica. O'Connor sent 7th Armoured Division across the interior from Mechili through Msus and Antelat. John Combe's wheeled column went ahead of the tanks and reached the coast road first. Its roadblock at Sidi Saleh held long enough for the armoured brigades to arrive and close the route south.

The Matilda II gave the opening attacks a protected breakthrough vehicle whose armour resisted most Italian anti-tank weapons at ordinary battle ranges. At Nibeiwa and later at Bardia and Tobruk, engineers and infantry opened routes through wire, mines and anti-tank ditches while the tanks carried firepower through the breach. Mines, direct artillery hits and mechanical wear steadily reduced the number available.

Cruiser tanks and armoured cars supplied the speed needed after the camp battles. Their serviceable strength declined as the advance lengthened, yet 7th Armoured Division still had enough mobile vehicles to screen the coast road, move through Mechili and Msus, and reach Beda Fomm. The 25-pounder travelled with the mobile formations and could shift from field artillery work to direct fire against tanks when the roadblock came under pressure.

RAF reconnaissance and attacks on Italian airfields helped protect the movement of the ground force, while naval gunfire supported the coastal fortress battles. Tobruk's capture shortened the supply route once the harbour reopened. Fuel, water, ammunition, workshops and captured Italian vehicles then sustained the westward movement through Cyrenaica.

The British official history records about 130,000 Italian prisoners during Compass, together with 180 medium tanks, more than 200 light tanks and 845 field guns or larger pieces captured or destroyed. British and Commonwealth campaign losses were 500 killed, 1,373 wounded and 55 missing. These are campaign-wide totals covering ten weeks of fighting and pursuit.

Individual battles carried their own accounting boundaries. The 6th Australian Division suffered 456 casualties during the three-day fight for Bardia. Tank strength also fell through mines, gunfire and mechanical failure; by Beda Fomm the armoured brigade was fighting with only a small fraction of the cruiser tanks that had begun the offensive.

Italian formations entered the battle with strong artillery positions and large numbers of men but limited transport, dispersed armoured forces and fortified camps separated by open ground. Once the camp system broke, command links and road movement became progressively harder to restore. Bardia and Tobruk then fell in succession, and the retreat from Cyrenaica ended when the Via Balbia was blocked at Beda Fomm.

I. S. O. Playfair's British official history provides the campaign chronology and the accounting for prisoners, British losses and captured equipment. Wavell's despatch records the command view of the operation from the opening movement through the destruction of the Tenth Army.

Gavin Long's Australian official history and Australian War Memorial battle records provide the detailed accounts of Bardia, Tobruk and the Australian advance through Cyrenaica. They are used to keep divisional and battle casualties separate from campaign totals.

Imperial War Museums, the Australian War Memorial and the Italian Central State Archive provide the photographic record used on the chronology and equipment cards. Captions retain the date precision and identification supplied by those archival records.