The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Army Distinguished Service Medal to Lieutenant Colonel (Corps of Engineers) Samuel Arthur Robertson, United States Army, for exceptionally meritorious and distinguished services to the Government of the United States, in a duty of great responsibility during World War I. As General Superintendent of Construction of the Light Railways, Lieutenant Colonel Robertson managed all the intricate details of complex organization and classification of tasks with a master hand. With untrained personnel he established a record for speed in track laying of the 60-centimeter lines, exciting the admiration of our allies. During the advance of the 1st Army, by his ceaseless activity, tireless energy, and great knowledge he performed his duty with marked credit to the Government.