The book "21st Missouri Volunteer Infantry Regiment: Historical Memoranda" is a valuable document dedicated to the history of the military service of one of the units during the American Civil War. The book details the events in which the veterans of the 21st Missouri Infantry Regiment took part, their combat actions, important moments and contributions to victory. Because of the pearl of detail and the objectivity of the approach, this book has become a source of valuable information for historians, researchers and anyone interested in military history. "The 21st Missouri Volunteer Infantry Regiment: Historical Memoranda" reveals the heroism and self-sacrifice of the soldiers who defended their country during the greatest civil war in the history of the United States of America.