forces fighting in the Battle of Stalingrad quickly to defeat the Red Army, then move south through the Trans-Caucasus and threaten Iran (Persia) and the Middle East. If successful, large numbers of British and Commonwealth forces would have to be sent from the Egyptian front to reinforce the Ninth Army in Iran, leading to the postponement of any offensive against his army. Rommel hoped to convince OKW to reinforce his forces for the eventual link-up between and the German armies fighting in southern Russia, enabling them finally to defeat the British and Commonwealth armies in North Africa and the Middle East. In the meantime, the dug in and waited for the attack by the Eighth Army or the defeat of the Red Army at Stalingrad. Rommel added depth to his defences by creating at least two belts of mines about apart, connected at intervals to create boxes (Devil's gardens) which would restrict enemy penetration and deprive British armour of room for manoeuvre. The front face of each box was lightly held by battle outposts and the rest of the box was unoccupied but sowed with mines and explosive traps and covered by enfilading fire. The main defensive positions were built to a depth of at least behind the second mine belt. The Axis laid around half a million mines, mostly Teller anti-tank mines with some smaller anti-personnel types (such as the S-mine). (Many of these mines were British and had been captured at Tobruk). To lure enemy vehicles into the minefields, the Italians dragged an axle and tyres through the fields using a long rope to create what appeared to be well-used tracks. Rommel did not want the British armour to break out into the open because he had neither the strength of numbers nor fuel to match them in a battle of manoeuvre. The battle had to be fought in the fortified zones; a breakthrough had to be defeated quickly. Rommel stiffened his forward lines by alternating German and Italian infantry formations. Because the British deception confused the Axis as to the point of attack, Rommel departed from his usual practice of holding his armoured strength in a concentrated reserve and split it into a northern group (15th Panzer Division and 133rd Armoured Division "Littorio") and a southern group (21st Panzer Division and 132nd Armoured Division "Ariete"), each organised into battle groups to be able to make a quick