Great report, thanks.
This scenario, if I'm not mistaken, looking at C.S.G.'s map, appears in his book Scenarios for Wargames published by Wargames Research Group 1981 (not the book he co-wrote with S. Asquith which I believe is different).
Sometimes available on ebay, I'd highly recommend the investment in this book if you see it come up. My dog eared copy is ex library but, I'm the one who has dog eared it with constant use over the years and frequently get it out for inspiration. Of all my 'Old School' books (Charles hates that term and prefers not to be bracketed in that way, and if his books are to be bracketed prefers 'traditional' as a description), this is by far the most looked at.
The scenarios in the book (x 52) are all simply laid out with only the basic detail of the map, scenario outline, forces and mission objectives, plus umpire notes where required. Most are not period specific and are written in such a way that a specific horse and musket or ancient period is not immediately brought to mind; a few are for modern periods (e.g. have a railway, or helicopters, or parachutes); one or two might be deemed 'colonial' in its broadest sense (but could be the Sudan to the Old West, etc.); two or three might be deemed mini-campaigns fought over areas bigger than one table (though only one gaming table is required) using some map movement and planning.
I love the book, and I'd hate to be without the dogeared old thing.