Operation Sonnenblume (, "Operation Sunflower") was the name given to the dispatch of German and Italian troops to North Africa in February 1941, during the Second World War. The Italian 10th Army () had been destroyed by the British, Commonwealth, Empire and Allied Western Desert Force attacks during Operation Compass The first units of the new (DAK), commanded by Erwin Rommel, departed Naples for Africa and arrived on 11 February 1941. (In the English-speaking world, the term became a generic term for German forces in North Africa.) On 14 February, advanced units of the 5th Light Afrika Division (later renamed the 21st Panzer Division), (Reconnaissance Battalion 3) and (Anti-tank Detachment 39) arrived at the Libyan port of Tripoli and were sent immediately to the front line east of Sirte.
Rommel arrived in Libya on 12 February, with orders to defend Tripoli and Tripolitania, albeit using aggressive tactics. General Italo Gariboldi replaced (Marshal of Italy) Rodolfo Graziani as the Governor-General of Libya on 25 March and Mario Roatta, Commander in Chief of the Royal Italian Army (Regio Esercito), ordered Graziani to place Italian motorised units in Libya under the new Italian–German command. The first German troops reached Sirte on 15 February, advanced to Nofilia on 18 February and a German raiding party ambushed a British patrol near El Agheila on 24 February. On 24 March, the Axis captured El Agheila and on 31 March attacked Mersa Brega. The understrength 3rd Armoured Brigade failed to counter-attack and began to retreat towards Benghazi the next day.
When the 3rd Armoured Brigade moved, its worn-out tanks began to break down, as had been predicted. The brigade failed to prevent Axis flanking moves in the desert south of the Cyrenaican bulge, that left the Australian infantry in Benghazi with no option but to retreat up the . Rommel split his forces into small columns to harry the British retreat, as far as the Axis fuel and water shortage permitted. A considerable British force was captured by the Italians and Germans at Mechili, leading to the British retreat continuing to Tobruk and then on to the Libyan–Egyptian frontier. Between Mechili and Derna many prisoners were taken. Axis forces failed to capture Tobruk in the first rush and Rommel then had to divide the Axis forces between Tobruk and the frontier.
succeeded because the ability of the Axis to mount an offensive was underestimated by General Archibald Wavell, the Commander in Chief Middle East, the War Office and Winston Churchill. Rommel transformed the situation by his audacity, which was unexpected, despite copious intelligence reports from the decryption of signals from the German Enigma coding machine and MI14 (British Military Intelligence). Many experienced British units had been transferred to Greece in Operation Lustre and others to Egypt to refit. Some commanders appointed by Wavell to Cyrenaica Command (CYRCOM) failed to live up to expectations and Wavell relied on maps that were found to be inaccurate, when he later arrived to see for himself. In 1949, Wavell wrote, "I had certainly not budgeted for Rommel after my experience of the Italians. I should have been more prudent...".
Background
Italian invasion of Egypt
was the plan for an Italian invasion of Egypt in 1940 to seize the Suez Canal that began the Western Desert Campaign (1940–1943). The Italians were opposed by British, Commonwealth, and Free French forces. After numerous delays, the scope of the offensive was reduced to an advance by the 10th Army (Marshal Rodolfo Graziani) into Egypt to Sidi Barrani and attacks on any British forces in the area. The 10th Army advanced about into Egypt but only made contact with the British screening force from the 7th Armoured Division and did not engage the main force around Mersa Matruh. On 16 September, the 10th Army halted and took up defensive positions around the port of Sidi Barrani, intending to build fortified camps, while waiting for engineers to extend the () with the . Graziani intended to use the road to accumulate supplies for an advance on Mersa Matruh, about further east, where the remainder of the 7th Armoured Division and the 4th Indian Division were based.
Operation Compass
The British Western Desert Force (WDF, Lieutenant-General Sir Richard O'Connor) attacked the 10th Army in western Egypt and Cyrenaica, the eastern province of Libya from December 1940 to February 1941. The WDF, with about advanced from Mersa Matruh in Egypt for a five-day raid against the 10th Army. The Italian force had about in fortified posts around Sidi Barrani and further west, over the border in Cyrenaica. The 10th Army was swiftly defeated, Sidi Barrani and Sollum were re-captured, and the British continued the operation, attacking through Cyrenaica to capture Bardia, Tobruk, and Derna. The British then pursued the 10th Army along the around the Jebel Akhdar (Green Mountain) towards the western province of Tripolitania. Combe Force, an flying column, moved through the desert south of the Jebel and intercepted the last organised units of the 10th Army at the Battle of Beda Fomm. The WDF then chased the remnants of the 10th Army to El Agheila on the Gulf of Sidra. The British captured and Libyan prisoners, hundreds of tanks, and over and aircraft, while suffering only killed or wounded.
The British were unable to continue beyond El Agheila, due to supply difficulty and worn-out vehicles. In February 1941, the British War Cabinet decided to hold Cyrenaica with the minimum of forces and send the remainder to Greece. The most experienced, best-trained, and best-equipped units of the WDF were diverted to the Greek Campaign in Operation Lustre in March and April 1941. In Cyrenaica, the 6th Australian Division was up to strength but the vehicles of the 7th Armoured Division were worn out. The 2nd New Zealand Division had two brigades available and the 6th Infantry Division in Egypt had no artillery and was training for operations in the Dodecanese Islands. The 7th Australian Division (Major-General John Lavarack) and the 9th Australian Division were poorly-equipped and still training, a Polish Brigade Group was short of equipment and two armoured regiments, detached from the 2nd Armoured Division to the 7th Armoured Division, had also been worn out in the later stages of Operation Compass. The rest of the division had two cruiser tank regiments whose tanks had worn-out tracks and two light tank regiments; the divisional commander had died suddenly and been replaced by Major-General Michael Gambier-Parry.
Siege of Giarabub
The Siege of Giarabub (now Jaghbub), took place in the aftermath of the defeat of the 10th Army. The fortified Italian position at the Al Jaghbub Oasis was besieged by parts of the 6th Australian Division. The 6th Australian Divisional Cavalry Regiment began the siege in December 1940, leaving the Italian garrison dependent for supplies on the (the Italian Royal Air Force). Air transport proved insufficient and hunger prompted many of the locally recruited troops to desert. After being reinforced by the 2/9th Australian Battalion and a battery of the 4th Royal Horse Artillery, the Australians attacked on 17 March 1941 and forced the Italian garrison to surrender on 21 March.
Terrain
The war was fought primarily in the Western Desert, which was about wide, from Mersa Matruh in Egypt to Gazala on the Libyan coast, along , the only paved road. The Sand Sea inland marked the southern limit of the desert at its widest at Giarabub and Siwa; in British parlance, Western Desert came to mean eastern Cyrenaica too. From the coast, extending south lies a raised, flat plain of stony desert about above sea level, about from north to south, as far as the Sand Sea. Scorpions, vipers and flies populated the region, which was inhabited by a small number of Bedouin nomads.
Bedouin tracks like the Trigh el Abd and Trigh Capuzzo, linked wells and the easier traversed ground; navigation was by sun, star, compass and "desert sense", good perception of the environment gained by experience. When Italian troops advanced into Egypt in September 1940, the Maletti Group left Sidi Omar and got lost, having to be found by reconnaissance aircraft. In spring and summer, the days are miserably hot and nights are very cold. The Sirocco (also known as or ), a hot desert wind, blows clouds of fine sand which reduces visibility to a few yards and coats eyes, lungs, machinery, food and equipment. Motor vehicles and aircraft need special oil filters. In such barren country, supplies for military operations have to be transported from outside. German engines, particularly motorcycles, tended to overheat and tank engine life fell from to , made worse by difficulties of maintaining diverse German and Italian motor types.
Supply
The normal sea route for Italian supplies to Libya went west round Sicily, then close to the coast to the port of Tripoli, to avoid interference from British aircraft, ships and submarines based at Malta; a third of the Italian merchant marine had been interned after Italy declared war and the diversion increased the voyage to about . On land, supplies had to be carried huge distances by road or in small consignments by coaster. After the Italian defeat in Operation Compass, Tripoli was the last remaining Axis port, with a maximum unloading capacity of four troopships or five cargo ships at once, enough for the delivery of about of freight per month. The distance from Tripoli to Benghazi was along the , which was only half-way to Alexandria.
The road could flood, was vulnerable to attacks by the Desert Air Force (DAF) and using desert tracks increased vehicle wear. A German motorised division needed of supplies per day and moving those supplies was calculated to need two-ton lorries on top of the divisions own vehicles. With seven Axis divisions, air and naval units, of supplies per month were needed. From February to May 1941, a surplus of was delivered from Italy. British attacks from Malta had some effect but in May, the worst month for shipping losses, 91 per cent of the supplies arrived. Lack of transport in Libya left German supplies stranded in Tripoli, while the Italians had only for deliveries to A record amount of supply arrived in June but at the front, shortages worsened.
Prelude
German intervention
German involvement in the western Mediterranean began with the arrival in Italy during June 1940, of , General Maximilian von Pohl), a liaison organisation to handle intelligence matters. air units arrived in Italy in October, to carry Italian troops to Albania and then on 15 November, 2 ( Albert Kesselring) transferred from Germany and ( Hans Geisler) moved from Norway to Sicily. By January 1941, X had bombers, bombers, forty twin-engined fighters, and twenty reconnaissance aircraft. X took over operations in southern Italy, Sicily, and part of Sardinia, and later took over in North Africa, with orders to secure the sea route from Italy to North Africa by neutralising Malta. Attacks were to be made on British supply routes to Egypt and Axis forces in North Africa were to be supported by the (General Stefan Fröhlich). The first sorties of the were flown on 7 January, against a British convoy and escorts off the Algerian coast.