Map 4. Fortress Tobruk
The 150 individual strongpoints along the perimeter had been placed in a zigzag pattern, with the posts one forward and one in the rear, with intervals of about 750 yards between forward posts. The effect was of two parallel rows of posts, the second row 500 yards behind the first and filling in the gaps between the forward posts. The posts were numbered consecutively, the odd-numbered posts being on the perimeter, the even posts behind them. A typical post was eighty meters long and contained three circular concrete weapons pits emplaced flush with the ground and connected by a concrete communications trench.11 This trench was about 2 1/2 meters deep and covered over with boards and a thin layer of earth. Around the post was an antitank ditch. Observation from the posts was excellent, the fields of fire good, and the perimeter wire well placed. A forward post, in most cases, could enfilade both arms of perimeter wire leading out from it, the fire forming a beaten zone forward of the next post (see figure 1).12
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Figure 1. Tobruk Strongpoint
Behind the first line of defense, called the Red Line, antitank mines were placed in depth to prevent deep penetrations. Two miles behind the Red Line was the Blue Line, occupied by the three reserve battalions. General Morshead's instructions were that if the enemy penetrated the Red Line, the forward posts were to hold at all costs, while the Blue Line absorbed the attack. If the enemy penetrated the Blue Line and the Cyrenaica command's mobile reserve was unable to stop them, then every support element left would make a last effort at the Green Line (see map 5).
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Map 5. Tobruk defense lines
Combat Organization of Friendly Forces
The 9th Australian Division had been formed on 23 September 1940. When Major General Morshead took command on 5 February 1941, little did he realize that his division would be heavily engaged in two months. The 20th Brigade, formed in May 1940, had been in Palestine three months; the 26th, formed in July 1940, had been there one month. None of the brigades had received a full issue of weapons, yet each had fired automatic weapons in range practice. Individual training was well advanced, and there had been some subunit training. However, battalions and regiments had not conducted unit exercises, and the training of brigades as battle groups had not begun. In short, the individual soldiers had been trained to fight, but the officers and staffs had not yet been trained in the complex techniques of battlefield management and the integration of combined arms formations.
Brigades in the 2d Australian Imperial Forces (AIF) contained three battalions, each recruited chiefly on a regional basis. For the sake of tradition, battalions took the numbers of their counterparts in the World War I 1st AIF, with the prefix 2- preceding the new unit designations. In addition to its headquarters and support companies, the battalion consisted of four rifle companies, each composed of three 30-man platoons. The strength of an Australian infantry battalion varied, but in the Middle East it contained 32 officers and 750 to 770 men. The total strength for an infantry division was about 14,000, to include its headquarters, three brigades, an antitank regiment, field artillery regiment, engineers, and signal.13
By 10 April 1941, the garrison at Tobruk consisted of the 9th Australian Division with its three brigades of infantry-the 20th, 24th, and 26th-together with the 18th Brigade of the 7th Australian Division and several thousand British and Indian troops. Altogether, 14,270 Australian troops; 9,000 British troops; about 5,700 troops of mixed Australian, British, and Indian origin; and 3,000 Libyan laborers defended Tobruk.14
General Morshead's concept of defense was based on four principles: no ground should be given up; garrisons should dominate no-man's-land by extensive nightly deep patrolling; no effort should be spared in improving the defensive positions and obstacles; and the defense should be organized in depth, with a large mobile reserve.15
The twenty-eight miles of perimeter were occupied by the division's three brigades. From west to east, they were the 26th, 20th, and 24th Brigades, respectively. Part of the garrison's reserve, the 18th Brigade, was located in Wadi Auda, near the sea west of town, and the 3d Armored Brigade had the responsibility for covering the approaches to Pilastrino extending to the El Adem-Bardia road junctions. Six battalions manned the forward perimeter, and one battalion in each brigade sector was positioned to the rear, as brigade reserve. Each battalion on line occupied an average of five miles, with more than two companies plus maintained as a reserve dug in one-half mile to the rear. Ten to fifteen infantrymen occupied each post.
The 2-24th Battalion with one company of the 2-23d Battalion occupied the right-hand sector from the coast to the escarpment, a distance of six miles. On their left, covering the highest point on the perimeter, Ras el Medauuar (Hill 204), was the 248th Battalion. Farther on the left was the 2-17th Battalion, which covered the southern approaches to Fort Pilastrino, where the division headquarters was located. Next was the 2-13th Battalion astride the El Adem road, then the 2-28th Battalion. On the 2-28th's left, covering from the main east-west road to the coast, was the 2-43d Battalion. With field artillery and antitank artillery being the garrison's main defense against an armored attack, all guns were sited in an antitank role. Gun pits were made large and shallow to enable rapid traverse and to assure clear fields of fire in all directions.
The forty-eight 25-pounders of the three Royal horse artillery (RHA) regiments and the twelve 18-pounders and twelve 4.5-inch howitzers of the 51st Field Regiment were organized into three groups to cover the three infantry brigades on line.16 The 51st Field Regiment was in direct support of the 26th Brigade in the west; the 104th RHA was in support of the 24th Brigade in the east. In the central (southern) sector held by the 20th Brigade, the 1st and 107th RHA were formed into a tactical group of thirty-two guns. The guns were mainly employed at the escarpment below Pilastrino and near Sidi Mahmud.
With the exception of the 8th Battery of the 3d Light Antiaircraft (AA) Regiment, which was Australian, all the antiaircraft guns were manned by British troops. The 4th AA Brigade consisted of the 153d and 235th Heavy AA Batteries from the 51st Heavy AA Regiment; the 14th Light AA Regiment; and the 39th, 40th, and 57th Light AA Batteries from the 13th Light AA Regiment.17 At the beginning of the siege, the anti-aircraft artillery in Tobruk consisted of sixteen mobile 7-inch guns (heavy) in action and eight unmounted guns not yet brought into action; five mobile and twelve static 40-mm Bofors (of which six static guns were not in action); and forty-two captured 20-mm Italian Bredos. As soon as four of the static 3.7-inch guns were brought into action, four heavy mobile guns were released for perimeter defense to deter enemy dive-bombers and observation aircraft. However, whenever Allied ships were unloading in the port, the mobile guns were returned to the harbor area.18
Additionally, captured Italian 75-, 100-, and 149-mm guns were employed by the so-called Australian "bush artillery" (infantrymen without gunner training who manned and fired guns from their battalion positions). By 9 April, all remaining armored units were organized into the 3d Armored Brigade. These included the 1st Kings Dragoon Guards, with thirty armed Mormon-Harrington scout cars; the 3d Hussars; and the 5th Royal Tanks, forming a composite unit of four cruisers and eighteen light tanks.19 The Ist Royal Tank Regiment was composed of nineteen cruisers and fifteen light tanks; and the 4th Royal 'Tank Regiment was comprised of a troop of four Mark II Matilda (infantry) tanks.20 In all, about sixty tanks were operational with another twenty-six undergoing repairs.
Australian troops dug in, North Africa
The source of all photos in this work is Australian War Memorial, Canberra, Pictorial History of Australia at War 1939-45, vol. (Canberra: [S.N.] ), 1959.
There were only 113 antitank guns in the garrison, half of which were captured Italian Bredo 47- and 32-mm gunsweapons that could penetrate 30 millimeters of steel plate at 1,000 yards but had a traverse of only 60 degrees.21 Antitank units were the Australian 2-3d Antitank Regiment with four of its six batteries-the 9th, 10th, 11th, and 12th; the three brigade antitank companies; and the British 3d RHA Antitank Regiment, with its M and J Batteries but minus D Battery. Antitank regiments were normally organized with three battalions, each having two 8-gun batteries. Each battery had two 4-gun troops, and each troop had two sections of two guns. The principal British antitank gun at the time was the British 2-pounder. However, British antitank guns suffered badly in comparison with German guns because, in most cases, they did not have the weight, penetrating power, or range that the German 50-, 57-, 75-, and 88-mm weapons possessed. The 2-pounder was outranged and nearly ineffectual, as it could not penetrate the Mark III and IV beyond 500 meters.22 As a result, the 25pounders, with a direct-fire range of 1,000 yards, bore the brunt of the antitank defense. The total number of 2-pounders at Tobruk is not known, but there was a critical shortage of such weapons.
All Royal Air Force (RAF) units in the desert were under No. 204 Group. Reconnaissance, close air support, and air interdiction were provided by a forward command post of the No. 204 Group along with the No. 73 Squadron (Hurricane) and the No. 6 Squadron (Hurricane and Lysinder), which were under the fortress commander. Bomber support was provided by Blenheim IV bombers of Nos. 45 and 55 Squadrons, which could rearm at the Tobruk airfields. Fourteen Hurricanes were kept at Tobruk during daylight hours for immediate response.23
Combat Organization of Enemy Forces
The German 5th Light Division faced the Australians at Tobruk. The 5th was a light armored division, somewhat weaker in force structure than the usual German armored division. The German High Command was preoccupied with equipping its forces for the coming invasion of the USSR, so Rommel's initial mission was defensive rather than offensive. The 5th Division, consequently, had only three-quarters of its allocated motor transport and was short some 50 tanks of the 200 authorized to it. However, it was far stronger than the battle-depleted 2d Armored Division that it initially opposed. The German 5th Light Division consisted initially of a headquarters; the strong and partly armored 3d Reconnaissance Unit with its company of about twenty-five armored cars; the 5th Armored Regiment with its 1st and 2d Battalions containing a total of seventy light Mark II tanks and eighty medium Mark IIIs (with 50-mm guns) and Mark IVs (with 75-mm guns);24 a fully motorized machine-gun regiment with the 2d and 8th Battalions; the 175th Artillery Regiment with a twelve-gun field artillery battery; and the 605th Antitank Regiment, with the 33d and 39th Antitank Battalions (thirty-three 37- and 50-mm antitank guns in each, plus several 88-mm antiaircraft guns in the 33d).25 Though these units had no desert training, most had operational experience in the campaigns in Poland and France. Additionally, in the German's favor, the Mark III could penetrate the armor of British tanks at 1,000 yards due to its superior ammunition and optics.26 The Mark IVs could shell the British armor and antitank guns at 3,000 yards with impunity.27
Rommel's German Air Force support came from Fliegerkorps X, commanded by General Frohlich. Fighter and dive-bomber units worked in conjunction with Rommel but were not under his control. The total strength of Fliegerkorps X varied between 400 and 450 aircraft, of which only about 250 were serviceable at any one time. This included thirty single-engined fighters, thirty twin-engined fighters, approximately eighty dive-bombers, and fifty to sixty long-range bombers.28
Rommel continually task organized the German and Italian forces to fit the mission. New groupings and new commands were set up almost daily, with the major units, the 5th Light Division and the Italian Ariete and Brescia Divisions, constantly shifting units.
The Italian forces, operating with their German allies, consisted of elements of three divisions: the 27th (Brescia) Division, the 102d (Trento) Motorized Division, and the Armored 132d (Ariete) Division. The two infantry divisions mustered slightly more than six infantry battalions each. The armored division had some eighty tanks, mainly of the M-13 variety, but possessed few antitank guns.29 The combined German-Italian forces consisted of around 25,000 combat, combat support, and combat service support troops (although these figures are not fully documented).


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