Leonaur is an unusual publisher. They specialize in reprinting old military history books that have long been either out of print and/or in the public domain, and because of this their prices are reasonably good, especially for hardback copies.
If you're looking for that latest best-seller, ”Waterloo: the Final True Story- No, Really”, you won't find it here. But there are some interesting well known and not-so-well known classics in their catalogue- as well as a certain amount of dross. Worth a browse.