No, I'm trying to find camps to attack without skills first, still waiting for the elusive manuscript recipe from Excelsior
Anyway, you got your answer from SnowBlizz, so I hope it clarifies things.
No, it's rather impossible with unskilled Mary.
However, if you use Evil_J's guide for skilled CoA, you'll see the solutions that separate attacks on C2 - L1 (and also C8 - L3), so using 3 generals (MoD/BHG/Tavern to block C1, Mary to kill C2 and Major (or better Anslem) to kill L1), you'll get the benefits of Mary Christmas, and you still block C1.
Same thing for C7 (block) C8 (Mary) L3 (Major or Anslem).