Military and civilian observers from every major power closely followed the course of the war. Most were able to report on events from the perspective of embedded positions within the land and naval forces of both Russia and Japan. These military attachés and other observers prepared first-hand accounts of the war and analytical papers. In-depth observer narratives of the war and more narrowly focused professional journal articles were written soon after the war; and these post-war reports conclusively illustrated the battlefield destructiveness of this conflict. This was the first time the tactics of entrenched positions for infantry defended with machine guns and artillery became vitally important. Both would become dominant factors in World War I. Even though entrenched positions had already been a significant part of both the Franco-Prussian War and the American Civil War, it is now apparent that the high casualty counts, and the tactical lessons readily available to observer nations, were completely disregarded in preparations for war in Europe, and during much of the course of World War I.