Over decades, art historian Dr Wolfgang Knop has amassed an extensive collection of illustrations, postcards and letters by contemporary artists. This volume presents those nearly 100 collection pieces that deal with war and warlike conflicts, documenting, reflecting and commenting on them. The works range from World War I to the turn of the millennium and vividly illustrate the artists' engagement with war, its lasting consequences, and their pacifist position, which is expressed in the combination of words and images on the correspondence pieces. Wolfgang Knop explains and comments on the individual sheets in an extensive contribution and provides valuable background information.