Infantry Division "Superga", knocked out 11 tanks but their advance was halted while the fight at Djebel Abiod continued for nine days. On 22 November, tanks from the Italian 50th Brigade forced US paratroopers to abandon Gafsa. The two Allied columns concentrated at Djebel Abiod and Béja, preparing for an assault on 24 November. The 36th Brigade was to advance from Djebel Abiod toward Mateur and 11th Brigade was to move down the valley of the River Merjerda to take Majaz al Bab (shown on Allied maps as Medjez el Bab or just 'Medjez') and then to Tebourba, Djedeida and Tunis. Blade Force, an armoured regimental group made up of 37mm gun M3 Stuart light tanks and 75mm M3 GMC self-propelled anti-tank guns, was to strike across country on minor roads in the gap between the two infantry brigades towards Sidi Nsir and make flanking attacks on Terbourba and Djedeida. The northern attack did not take place because torrential rain had slowed the build-up. In the south 11th Brigade were halted by stiff resistance at Medjez. Blade Force passed through Sidi Nsir to reach the Chouigui Pass, north of Terbourba part of B Squadron Stuart's from Blade Force infiltrated behind Axis lines to the newly activated airbase at Djedeida in the afternoon and destroyed more than 20 Axis planes but lacking infantry support, withdrew to Chouigui. The understrength tank Squadrons and three M3 GMC French 75s were to hold the pass. A mixed unit of Panzer III and Panzer IVs and a small Italian scouting Force, around 15 tanks all told. Frontal attacks by the GMCs and Stuarts were ineffective losing 12 tanks, but allowed a rear attack by B Squadron firing into the weaker rear armour of the German tanks. The German commander, believing he had encountered a much stronger force, retreated. Blade Force's attack caught Nehring by surprise and he decided to withdraw from Medjez and strengthen Djedeida, only from Tunis. The 36th Brigade's delayed attack began on 26 November but they were ambushed with the leading battalion taking 149 casualties. Further attacks were driven back from cleverly planned interlocking defences. 1 Commando landed west of Bizerte on 30 November to outflank the Jefna position, but failed and rejoined 36th Brigade by 3 December. The position remained in German hands until the last days of fighting in Tunisia the following spring. Early on 26 November, as the Germans