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By July 1942 the German Afrika Korps under General Erwin Rommel had struck deep into Egypt, threatening the vital British supply line across the Suez CanalThe Suez Canal ( Arabic, Qan al-Suways , west of the Sinai Peninsula, forms a 163 km (101 mile) ship canal in Egypt between Port Said Bur Sa'id on the Mediterranean and Suez al-Suways on the Red Sea. The canal allows water transport from Europe to Asia wi. Faced with overextended supply lines and lack of reinforcements and yet well aware of massive Allied reinforcements arriving, Rommel decided to strike at the Allies while their build-up was still not complete. This attack on 30 August 1942 at Alam HalfaThe Battle of Alam el Halfa took place between August 30 and September 6, 1942 during the Western Desert Campaign of World War II. The combatants were the Afrika Korps, commanded by Erwin Rommel ("the Desert Fox") and the British Eighth Army, commanded by failed, and expecting a counterattack by Montgomery´s Eighth ArmyThe Eighth Army was one of the best-known formations in World War II, fighting in the campaigns in North Africa and Italy. In fact it was "British" in name only, as many of its component units were from Commonwealth countries, including Australia, Canada,, the Afrika Korps dug in. After six more weeks of building up forces the Eighth Army was ready to strike. 200,000 men and 1,000 tanks under Montgomery made their move against the 100,000 men and 500 tanks of the Afrika Korps.
With Operation Lightfoot, Montgomery hoped to cut two corridors through the Axis minefields in the north. Armour would then pass through and defeat the German armour. Diversionary attacks in the south would keep the rest of the Axis forces from moving northwards. Montgomery expected a twelve-day battle in three stages — "The break-in, the dog-fight and the final break of the enemy."
The Commonwealth forces practised a number of deceptions in the months prior to the battle to wrong-foot the Axis command, not only as to the exact whereabouts of the forthcoming battle, but as to when the battle was likely to occur. This operation was codenamed Operation Bertram. A dummy pipeline was built, stage by stage, the construction of which would lead the Axis to believe the attack would occur much later than it in fact did, and much further south. To further the illusion, dummy tanks made of plywood frames placed over jeeps were constructed and deployed in the south. In a reverse feint, the tanks for battle in the north were disguised as supply lorries by placing a removable plywood superstructure over them.
The Axis were dug-in along two lines, called by the Allies the Oxalic Line and the Pierson Line. They had laid around half a million mines, mainly anti-tank, in what was called the Devil's Garden .