Attack on Titan, Vol. 11 collects chapters 43–46 ("The Armored Titan," "Strike, Throw, Submit," "The Hunters," and "Opening") of Hajime Isayama's manga, originally serialized in Kodansha's Bessatsu Shōnen Magazine. Thanks to Eren's timely arrival, the 104th Training Corps has turned the tide at Wall Rose — but the momentary victory forces two more traitors into a corner, and the identity of the Titans destroying the walls is revealed. Kodansha Comics published the English edition on January 28, 2014.
Note: audience, pace and core genre below reflect the Attack on Titan series as a whole (this volume is entry 11 of 34), grounded against the series' Wikipedia infobox (genres: action, dark fantasy, post-apocalyptic) and its Bessatsu Shōnen Magazine (shōnen/teen) serialization — not volume-specific claims beyond the chapter list and synopsis above.