Hi, it sounds like you're an enthusiastic reader. Did you know that the flaired users of this sub maintain a book list? Check it out here - there are books on both Alexander and WWI (although there's definitely room for recommendations specific to your requirements), as well as many other topics. Check it out here https://www.reddit.com/r/AskHistorians/wiki/books#wiki_books_and_resources_list or here https://www.goodreads.com/user/show/46890061-askhistorians