Did the campaign have an ‘Operation’ name such as Overlord, Husky, Dynamo etc.? If so, putting that in the title somewhere might be helpful. Couldn’t be worse than relying upon potential purchasers having an encyclopaedic knowledge of Churchill’s utterances. “The bit before the colon is the main title, the bit after is the sub-title.” Yes, I got that, it was the relationship between the two that I couldn’t grasp until you explained the Churchill bit. I suspect that many will be in the same boat and therefore may not have their interest aroused enough to pick up a copy.
Wikipedia has some useful information. Most of my knowledge comes from reading about the Commando involvement.