Anton Denikin, despite the rather firm line he'd take on "Russia - One and Indivisible" later in life, was actually half-Polish through his mother. They were close, and Denikin spoke exclusively Polish with her while otherwise presenting himself as firmly Russian. 
On that note, go here and download it: (archive.org/details/lastwh…). You never know when Chuck Wendig will decide to call his lawyers again, and this is long out of print unless @MysteryGrove is looking for a new project. Now, let's look at some highlights.