Meanwhile, the British Eighth Army was pressing German and Italian forces back from Egypt through Libya and reached the southern border of Tunisia in January 1943. Plans could then be perfected for a co-ordinated attack against the remaining Axis forces in North Africa by the British Eighth Army in the south and the Allied troops in the north consisting of the British First Army, the American II Corps, the French XIX Corps, and Allied air forces. Attack by Axis forces at points of their own selection repeatedly interfered with Allied preparations. In February the enemy broke through Faïd Pass and in a series of attacks advanced beyond Kasserine almost to the Algerian border. These attacks were stopped on 21–22 February when the enemy started his withdrawal, destroying bridges and mining the passes behind him. But the Allied forces were closing in. After attacking and turning the Mareth position, the British Eighth Army defeated the enemy there and pursued him along the coast as far as Enfidaville, less than fifty miles from Tunis. Accelerated Allied air and naval attacks choked off the enemy’s supply and weakened his resistance. At the same time the American II Corps was shifted northwest to a new sector on the left of the British First Army. Then after severe infantry fighting the American II Corps made an armored thrust to Mateur, and after a pause it pushed tank forces east to the sea, separating Bizerte from Tunis. Farther south the British First Army drove directly toward Tunis. On 7 May both Bizerte and Tunis were occupied and by 13 May Axis capitulation was complete. The Allies had achieved their initial objective of opening the Mediterranean route to the Middle East and seizing bases in North Africa. At the same time they had inflicted a major defeat on the Axis Powers. Allied strength in French North Africa had been brought to a total of about a million men. Much of this strength was not intended for the Tunisia Campaign but for later operations against Sicily and southern Italy. Elaborate training establishments were developed by the American Fifth and Seventh Armies and vast supply depots established with a view to future operations from the African base. Persian Gulf Command In June 1942 an American theater of operations called U. S. Army Forces in the Middle East was established with headquarters at Cairo. Under this command were merged various groups and military missions that had been active in this area since the spring of 1941. American responsibilities for moving supplies to the Soviet Union led ultimately to a separation of the Persian Gulf activities of USAFIME and their establishment under an organization that was known from December 1943 to October 1945 as the Persian Gulf Command, with headquarters at Tehran, Iran.