Simply look at the date (so 13th March for me). Go back 1 year and link to the post you put on your blog this day last year (or the closest one you can find to that date).So, I did. Somewhat embarassing, since I just narrowly missed it being A Horse of a Different Colour part NINE (part ten came out last week!). It is in fact a slightly belated battle report from a Principles of War game that was part of Gavin's first Penninsular campaign (the second seems to have stalled rather). Interesting fun, as I recall!
Thanks, Phil, for a neat idea. It is still the 13th in Seattle when this gets posted, too!