If you are talking 3-4 May 41, I, II & III/KG 27 (He 111); KGr 100 (He 111); I, II, III/KG 54 (Ju 88); Stab, I, II, III/KG 55 (He 111); II & III/KG 1 (Ju 88/He 111); I, II, III/KG 77 (Ju 88); III/KG 26 (He 111); KG 76 (Ju 88) were involved as was thought was I/KG 53 (He 111).
http://www.ww2.dk/ will give you an idea of bases they came from but as to route, I cannot say