The skies were clear as we located our enemy(?) point in Hiroshima, Japan. We dropped Little Boy on August 6 at 9:15 Am Tinian time. The five ton bomb exploded 43 seconds late at an altitude of 1800 feet with a bright flash and two shock waves that later hit the plane. Although I felt sorry for the citizens of Hiroshima there will be civilian casualties as long as military and civilian targets are mixed and despite our dropping thoughts of warning leaflets the mission was necessary to end the war with minimum casualties. Nevertheless, war is Hell. [signed] Dutch Van Kirk Navigator-Enola Gay Hiroshima 6 August 1945.