Here below listed the fighting forces involved in the invasion of Sicily by the Allies along with a brief description.
Allies Supreme Commander was Gen. Dwight D. Eisenhower from the United States.
Allies 15th Army Group: Commander Harold Alexander. This is a super unit composed specially for the invasion of Sicily, just like the 18th Army Group composed before the Battle of Tunisia. During the Tunisian campaign, Alexander served as the same level commander. For the invasion of Sicily, the Allies once again formed a huge army with two group armies and many units in which originally belonged to the 18th Army Group and Alexander continued to serve as the commander. The troops had two corps under its control, namely the British 8th Army and the U.S. 7th Army.
U.S. 7th Army: Commander George Patton. This is one of two main Allies forces invading Sicily, responsible for operations in the west of the island. The force contained a small amount of troops from the Free French. Many troops of the army took part in the fighting in North Africa, and accumulated a lot of combat experience. The military force composed of the unit directly under the control of the army group and two armies, namely the U.S. II Corps and the U.S. Provisional Corps.
British 8th Army: the commander of the army is Montgomery. This force fought in North Africa for a long time and had particularly rich experience. It won a decisive victory in the Battle of El Alamein, enabling the Allies to win the war in North Africa region. Then the force was sent to Sicily to perform attack missions and responsible for operations in the eastern island. The force composed of the unit directly under the control of the army group and two armies, namely the British XIII Corps and the British XXX Corps.
U.S. II Corps: subordinate forces of the U.S. Seventh Army. It was commanded by Omar Bradley. The force during the Tunisian campaign was defeated by the Germans for several times, mainly because the U.S. military lacked combat experience at that time. Later, the U.S. military summed up the reason of the failure and changed the army commander. And finally it with other forces eventually won the victory in the Battle of Tunisia. During the war in Sicily, it was in charge of important combat missions. It was the main forces of the 7th Army.
U.S. Provisional Corps: provisionally composed forces subordinate to the U.S. 7th Army. It was commanded by Geoffrey Keyes. It had an infantry division, one armored division and an airborne division. The forces first entered the Sicilian capital of Palermo and directly led to the collapse of Mussolini’s rule.
British XIII Corps: one of the main forces of the British Eighth Army. It was commanded by Miles Dempsey. The force was responsible for operations in eastern Sicily. It had three infantry divisions and an airborne division. It was also the troops for the initial landing operation.
British XXX Corps: subordinate forces of the 8th Army. Its commander was Oliver Leese. The forces included two infantry divisions, one of which came from Canada. It also had three independent brigades, one of which came from Canada. It was the first time for the Canadian troops to combat.
Supreme commander of defenders in Sicily is Italian Alfredo Guzzoni.
15th Panzergrenadier Division: German troops stationed in the island of Sicily before the war. The division in May was wiped out by the Allies in Tunisia when it was being rebuilt and finished in Sicily with the fighting capability was greatly weakened. The commander of the division was Eberhard Rodtfrom.
Luftwaffe Panzer Division Hermann Göring: had similar situation like the Germans mentioned above. It was also being rebuilt after being annihilated not long ago. The commander was Paul Conrath.
XIV Panzer Corps: after the Allies launched the invasion of Sicily, the force was sent for reinforcements. It had two divisions, which were recently removed from the troops involved in the Battle of Stalingrad. It was being rebuilt in Western Europe with the fighting force affected to some extent.
Italian XII Corps: this Italy had five army divisions, but only two of which had strong fighting capability, and the remaining three were Coast Guard divisions with inadequate training of personnel and weapons and equipment were in serious shortage.
Italian XVI Corps: it had four divisions, two of which had strong fighting capability. In addition, the force also contained a large number of other troops, but the combat capability and equipment of which were generally poor.