Michal,
- no ships were sunk in September 1939 by 'stukas' from St.G.2
-
http://forum.12oclockhigh.net/showthread.php?t=16668 and
http://forum.axishistory.com/viewtopic.php?t=121871
- during Battle of Crete St.G.2 at least sunk: destroyers GREYHOUND (also Ju.88 from LG.1 involved), HEREWARD, JUNO (sometimes claimed by Italian Cant Z.1007 - most probably JUNO fell victim to both groups), KELLY, KASHMIR and cruiser GLOUCESTER. Also damaged: aircraft carrier FORMIDABLE, battleship WARSPITE, cruisers AJAX, DIDO, ORION and destroyer NUBIAN
Also have a look at:
-
http://www.wlb-stuttgart.de/seekrieg/chronik.htm
- in google.books 'Junkers Ju 87 Stukageschwader of North Africa and the Mediterranean', 'Junkers Ju 87: Stukageschwader 1937-41' and 'Hitler's Stuka Squadrons'
There might be several useful information for you.
Hope it helps!
Andrzej