This is my thinking as of today.
Stab E-Art.Abt. 640 – Marseilles
Stab E-Art.Abt. 676 – Blankenberghe
Stab E-Art.Abt. 702
Stab E-Art.Abt. 725
Stab E-Art.Abt. 780 – Hendaye
German Guns:
E-Bttr.6/100 – Abbeville
E-Bttr.655 – Etaples (four 15cm K (E) L40?)
E-Bttr.664 – Hendaye (two 24 cm K (E) Theodor Bruno)
E-Bttr.674 – Hendaye (three 24cm K (E) Theodor)
E-Bttr.688 – (two 28cm K5 (E)?)
E-Bttr.690 – Bredene (four 28cm K (E) Kurze Bruno)
E-Bttr.696 – Dunkirk (two 28cm K (E)?)
E-Bttr.698 – Marseilles
E-Bttr.701 – (?) (two 21cm K (E) V12)
E-Bttr.710 – Calais (two 28cm K5 (E)?)
E-Bttr.712 – Wimereux (Pointe aux Oies) (one 28cm K5 (E), the second was at Anzio)
E-Bttr.717 – Blankenberghe (three 17cm SK (E) L40?)
E-Bttr.718 – Hayst (three 17cm SK (E) L40?)
E-Bttr.721 – Le Verdon (two 28cm kurz Bruno)
E-Battr.722 – Cherbourg (four 24cm)
E-Battr.1./725 – Vire (two 28cm K (E) neu Bruno)
E-Bttr.749 – Pertuis (two 31cm K5 (E) Glatt?)
E-Bttr.765 – Calais-Coquelles (two 28cm K5 (E))
Marine-Art.-Bttr Gneisenau – 19.-Armee (four 15cm SK (E))
2.(E)/ HKAR 1262 – Auderville-Laye (two 20cm SK C/34 (E))
Total = 46
Other possibilities (but probably not with Ob.West) include:
E-Bttr.713 – Wimille (Hydrequent) (two 28cm K5 (E)) (not in the Ob.West list)
E.-Bttr 687 – Lissweghe (two 20cm SK(E)) (not in the Ob.West list)
E.-Bttr 532 – Paimpol with (four 20cm SK(E)) (not in the Ob.West list)
Total = 8
Foreign Guns:
E-Bttr.692 – Marseilles (three 27.4cm K (E) 592 (f)?)
4.(E)/MAA 262 – Kerbonn (four 16.4cm K (E) M93/96 (f))
4.(E)/le-MAA 682 – Cap Cépet (three 34cm K (E) M 12 (f))
5.(E)/MAA 280 – Prefailles (two 24cm K (E) M93/96 (f))
Plouharnel Bttr./MAA 264 – Lorient (three 34cm K (E) 675 (f))
1.(E)/MAA 608 – Isle de Cézembre (six 19.4cm K (E) 486 (f))
Total (24-42cm) = 11
Ob.West identified railroad guns on 1 March 1944 as:
39 German guns in Heeres-Küsten-Artillerie
8 German guns in Marine-Küsten-Artillerie
3 foreign 24-42cm guns
Now, not including 1./725 (arriving in June), the above list includes 52 German guns (15cm-31cm) and 11 foreign guns (24-42cm). There appears to be a number of possible reasons for the discrepancy in the German guns. For one, it appears that E-Bttr.532, 687 and 713 may not have been in Ob.West at all between 1 March and 1 September 1944. In addition, planning documents of the 14.-Armee at Italy include the following as arrived or en route as of 31 January 1944:
One Zug of E-Bttr.712 with one K5 (E).
One Zug of E-Bttr.2./725 with one 28cm (E). Resolves that one – partially.
E-Bttr.Erhardt with two 24cm K (E) 557 (f).
These apparently were all drawn from Ob.West. I strongly suspect that the other Züge of 712 and 725 remained in France and simply got lost in the shuffle by the time of the 1 September report. Excluding the eight guns of E-Bttr.532, 687 and 713 entirely and deducting the two of 712 and 2./725 reduces the number of German guns to 42 versus the 48 given by Ob.West on 1 March. That is a closer match, but unfortunately still does not include any possible armament of 6./100 and 698, although it implies that each could have had three pieces.
However, the number of foreign guns remains 11. But I suspect that the eight guns of 4.(E)/le-MAA 682, 5.(E)/MAA 280 and Plouharnel Bttr./MAA 264 may not have been included in the 1 March report either, since they were all being more or less permanently emplaced. That would leave the three pieces of E-Bttr.692 as the only foreign guns in the 1 March listing, which is a perfect match.
If this is all correct, then it is possible that our list correctly accounts for all except six unidentified pieces from E-Bttr.6./100 and 698.
Thanks all - comments?
Rich