I think perhaps semi-mobile, in that they COULD be moved, but I seem to remember reading somewhere that it took days to emplace as the gun pit had to be dug out (the earth went into the stabilising bin!), the piece levelled etc. So I think once it was in they tended to stay where they were! Interestingly, I have an old WW2 propoganda book, “Britains Wonderful Fighting Forces”, which features a cutaway of the 9.2" Howitzer in its Army section, which would seem to imply it was still not declared obsolete 20 years later!
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