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Jg26 was based out of the Abbeville area, if that helps you any
Amsel, the link you provided is the same as the one Juha did. But you must have misunderstood something because on this web page same as in Jagdwaffe book is clearly stated that 7./JG 26 returned from Africa in late August. The Staffel's last recorded action in Africa occured on 21 August and they were still flying Bf 109E at that time.
It was III/JG 26 which arrived at Liegescourt on 1 June 1941 for conversion to the Bf 109F and 7./JG 26 joined them in late August returning from Africa.
This wasn't the only time that 7. Staffel was detached from the rest of the Gruppe, for in 1943 7./JG 26 spend five months (February-July 1943) on the Eastern front operating under JG 54.
Amsel, you beat me too it!Get the book by Donald Caldwell - JG 26. Good info there.