This is from "German Tanks of World War Two" by George Forty. After Talking about a US Ordnance Section report stating the ineffectiveness of British and American guns on German armor in the Middle East in early 1942 the book goes on to state: "Of course there were exceptions and the Americans must have been very heartened when they first came up against German armor in northern Tunisia in late 1942. Several companies of 1st Armored Division, equipped with M3 Stuarts, ambushed a small force of six PzKpfw IV 'Specials' and three or more PzKpfw IIIs on 26 November 1942. 'Swarming around the German tanks the Stuarts with their 37 mm guns firing on flank and rear at close range, managed to knock out all the PzKpfw IV's and one of the III's. However, as the Ordnance history goes on to explain: ' this was a victory of superior numbers rather than superiority of material'."
Fred