Calling all armchair generals! Boudica's Last Stand.

[Nathan Ross]

...anything on the subject by Haverfield before his entry in the 1911 Encyclopaedia Britannica (see below) but Oman in his 1910 'A History of England before the Norman Conquest' certainly refers to Haverfield's opinions as if there was something earlier...

Thanks for the link! I'd come across the 1910 Oman note, and assumed as you did that it relates to something previously published by Haverfield; an (undated?) reference by RG Collingwood also seems to support Haverfield as the originator of the idea. Haverfield's publications and collections of papers stretch back into the late 19th Century, and quite possibly one or another of them contains the origin. Alternatively, I suppose Oman might just have picked it up in conversation!