After the Allied invasion of French North Africa, the main part of France's air force, which the Vichy government had withdrawn to the colonies after the 1940 defeat – and had fought against the British or Americans on several occasions – went back on the Allied side. Of course, several problems arose at once. First, re-uniting the former Vichy Air Force and the Free French Air Force – both sides looking at the other one with disdain and resentment - proved to be a true political can of worms, as was having the proud Armée de l'Air serving under US tactical command… The other problem was easier to solve : the Armée de l'Air's material was desperately obsolete (most of its aircraft being war-weary machines that had seen the battles of 1940 – the Free French being equipped with old British material), and the personnel had no experience with modern Allied aircraft, procedures or tactics. First, second-hand or second-rate equipment was provided for training in North Africa, until the New French Air Force, having proven its skills and dedication to the Allied cause, was considered fit to carry the fight to Italy and France… this time with large numbers of much better aircraft (I'm not speaking of the war-weary P-39 Airacobras which were replaced with P-63s only after war's end), the spearhead of the Armée de l'Air's fighter-bomber force being 6 "groupes de chasse" of P-47 Thunderbolts, the air-superiority role being held by seven groups of Spitfire IXs.
Originally operating from Italy, then from Sardinia and Corsica until the Provence landings, mainly flying missions against German and R.S.I troops in northern Italy and the French Alps, the P-47 units then followed the Allied armies from airfield to airfield up the Rhône valley to Dauphiné, Bourgogne, Franche-Comté, Alsace and Lorraine, crossing the Rhine in April 45 and ending the war in southern Germany, some Thunderbolts being used against the German-held harbors of the Atlantic coast until the very last day. Their combat records show heavy losses and only few aerial victories… the reason for this is that the French Thunderbolts were used mainly for ground attack – rarely meeting a Luftwaffe that had become elusive, and playing a daily, deadly low-level attrition game against the Flak, mauling German trains and convoys, and more than once saving the day for the ground troops that had to face fierce resistance and brutal counter-attacks. A muddy, dangerous, unglamourous yet vital job performed under sometimes terrible weather conditions that won them the respect of their allies. After war's end, the remaining 131 "lend-lease" P-47s were given to France and stayed for 16 more years in service, flying their last combat missions in 1957 during the Algeria war (none of them seeing active service in Indochina). The last machines were written off in 1960, long after the Armée de l'Air had entered the "jet age".