Mary this is how you arrive at the first and fourth words of the message
8ac ACE = 1 BLACK = 2 Letter = 3 = C
9Ac TUI = 20 NOCTURNAL = 14 Letter= 34 = H
11Ac DOROTHY BAG = 4 WILL = W = 23 Letter = 27 = A
12 Ac EDAM = 5 INDIES = 9 Letter = 14 = N
14Ac DESPOILER = 4 CRUISE =3 Letter = 7 = G
15AC PENNE = 16 ORDNANCE = 15 Letter = 31 = E
9d CASE OUS = 3 FOLLOWING = 6 Letter= 9 = I
13Dn MNA = 13 ACTIVE = 1 Letter = 14 = N
Please e-mail me stuarttiffin@yahoo.com if you need any more details to be confirmed.