Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. War has always affected children, leaving millions killed, injured, homeless or orphaned. Moreover, throughout the history children have been directly involved in war, serving as soldiers or being used in support functions. According to statistics, there are more than 250,000 child soldiers involved in various military conflicts in 86 countries around the world. Learn more about the military use of children in this book.