Dimitri Rotov commented on my encounter with G.A. Townshend and about bad preservation choices in general. It's one of his longer-running themes, as he's pretty active on preservation issues.
About Gathland in particular, Tim Reese noted that he had written an article about that a few years ago in Maryland Historical Magazine, now out of print. Hrm. A googlesearch reveals another article by him discussing the monument here at HNN.