Thanks for the information guys. But that presents another quirk or problem, not sure which. My book says only that it is the war-cry of the Stewart Clan. It does not specify it as Stewart of Bute. To add to my problem, the clan badge of Stewart of Bute contains a unicorn's head. The Stewart of Galloway contains a cormorant feeding it young. Which would seem to me to relate to the war-cry better than the Unicorn.
I understand that the war-cries usually speak of a natural formation from the clan area.
So I guess I should ask, are Bute and Galloway near enough to one another so that they would both share the rock formation?