As I get older (or just 'old') I find myself returning to books from my younger days. I first found 'Charge!' in East Barnet Public Library in the early '70s and borrowed it many times. It's such a good fun book with a vein of irreverent humour and yet the authors clearly know their stuff about 18th and early 19th century warfare (the bibliography is impressive) and - something I didn't appreciate back then - had experienced battle themselves, having a DSO and two MCs between them. It's quite a thought, these two distinguished soldiers playing with their toy soldiers and having fun - and the emphasis is definitely on fun.
You would think that reading a set of rules for a game would be a dry business, but these are fun and interesting to read, even if you have no intention of playing the game. They explain the reasoning behind the rules and refer back to the history and give amusing examples of the rules in action. In one part they describe how they have simplified the reality but accept that keen practitioners may wish to come up with their own, more complicated rules and are "welcome to do so and need not send the results to us in writing"!
Back in the 1970s I was awestruck by the magnificent regiments of 30mm lead soldiers and the vast battlefields on show in the book. Sadly, I couldn't emulate such games myself, but still enjoyed the book. Fifty years later, my view hasn't changed, it is a true classic and a delightful read.