After the Battle of North Africa, the Mediterranean theater of Alexander served as deputy commander and chief of the 15 Supreme Allied Army Group commander, is responsible for organizing and coordinating the US 7th Army and the British Eighth Army offensive operations in Sicily, due to the joint Chiefs of Staff for the United States and Britain whether the offensive after the capture of Sicily to mainland Italy there is no clear indication of the Sicilian war plan with a clear defect that is difficult to surround and annihilate the defenders. July 10, 1943, Alexander commanding the British and US troops were landing operations in the Gulf of Gela and the Gulf of Noto. British troops suffered a serious setback in the main direction, the first American to advance Palermo to Messina and then take a break, the result is to be the remnants of German and Italian troops in August l7日通过墨西拿海峡逃回本土. The enemy casualties were 16 million people. Sicilian campaign led to the fall of Mussolini and the Italian government's unconditional surrender.
In order to capture the Italian mainland, Alexander ordered the British 8th Army (under the jurisdiction of the 30th Army, the 13th Army and Fifth Army) on the evening of September 2 crossed the Strait landed in Reggio US Fifth Army ( commander Clark, the jurisdiction of the US sixth Army, later increased US and British 2nd Army Corps) on September 9 landed at Salerno. At this time, the German Army entrenched Gustaf defense 10, the north German 4th Army. Alexander planned in 1944, after January 20 offensive Gustaf defense by the United States Fifth Army; by the US 2nd Army crossed the river to attack Lapido, attract Germans and backward, according to Leary Valley; US Sixth Army in defense behind the Anzio landing on the occasion, the remnants of the fifth Army took the opportunity to break through the defense. l944年 January 22, the Allied landing at Anzio, but not quickly advance to Rome, Allied attack on the Gustav line of defense is stalled. Germans began to organize large-scale counterattack against Anzio. Anzio Allied offensive two are in place to curb, February 18th and 29th, the Germans launched a massive counterattack twice, both by fighting and failure. Since then both long-term air strikes and artillery, Alexander adjust the Allied secret deployment: the withdrawal of the British 10th Army from the 5th Army, the Eighth Army assembled in the casino area, bear broke into Leary Valley main task. Its operational plan: 8th Army along Highway 6 to break through enemy defenses, straight from Rome; US Sixth Army attack from the Anzio beachhead, blocked Highway 6 in Valmontone. Thus, the retreat of the German 10th Army surrounded the Allies will be caught. May 10, Allied comprehensive offensive began. Juan command of the French army broke through the Gustav line of defense, the US military exploit a victory to advance to the Highway 7 leading to the Anzio and Alban Mountains. May 15, Eighth Army began plunging toward Leary Valley. German reaction to the US military provides the opportunity to break out from the beachhead. But Clark, while the US military command towards Valmontone into the attack, pointing out that after the capture of the main 奇斯泰尔纳 must be prepared to attack Rome, Alexander led the Germans to surround and annihilate the plan encountered damage. May 26, also north of Anzio allied onrush. June 4, the US military to occupy Rome, but the Germans had withdrawn.
1944 In December 2009, after Alexander Maitland Wilson was promoted to the Mediterranean theater Supreme Allied Commander, was promoted to marshal, Clark successor 15th Army Group commander. Gothic Allies had crossed the line of troops and weapons have advantages and air.
Alexander determined to surround and annihilate the Germans between the Reno River and the Po. April 9, 1945, the Eighth Army offensive to large-scale aerial bombing and artillery bombardment began, on the 18th through Aerzhanta Canyon; April 14, the Fifth Army began to attack. To 19 arrived in the outskirts of Bologna. April 20, Feitinghuofu want to withdraw to the Po River, but it was too late. April 25, guerrillas Italy general uprising, the Germans beaten everywhere. April 29, on behalf of the Germans forced to sign an unconditional surrender document on behalf of Alexander Allies surrender.