George Orwell, fighting in the International Brigades during the Spanish Civil War, 1936
(64.media.tumblr.com)
On top of that, funny enough, he found over the course of the war that he agreed more with the more radical left position of the Spanish Anarchists over the POUM. Not that he broke with the POUM over that realization or anything, he just noted that it was amusing.
Homage To Catalonia is really a fantastic read