During World War One, from 1914 to 1918, citizens of Mansfield served in military units including infantry, engineers, artillery, railway troops, coast artillery, and U.S. Marines. Among those honored were Walter Tod Ackerman, Antonio Alossi, Howard Merton Atkins, Joseph Leon Barrett, Thos. Arthur Barrows, Louis Jos. Beauregard, Fred Elroy Beebe, Benj. Arthur Brown, Clifford Edw. Botham, Walter E. Bradley, Amos Victor Breault, Edwin Leonard Brown, Harold F. Brown, James A. Byrne, Stanley M. Cerveny, Arthur Francis Clark, Leonard Clark, Harry A. Costello, John T. Costello, Lawrence D. Costello, Joseph Adelard Cote, William Jos. Courtney, Dr. Wm. Edward Cramm, Conrad Ellis Crane, Wm. Burdett Crane, Thomas James Curio, Harvey Carter Day, Lewellyn Victor Dodd, George Dewey Dore, Lawrence L. Dunstan, Wm. Francis Forsythe, Olin Maurice French, Irving W. Fuller, Albert Gitlen, Charles Gardner Hall, Paul J. Hauschild, Walter Hauschild, Egbert B. Inman, Harold S. James W., John Algot Johnson, Prescott E. Haskell, Ellsworth H. Langdon, Edward Landen, William Lee, Clifford Chas. W. Lyon, Wm. Charles Maass, Wm. Thomas McKernan, Stephen D. McNaughton, Edward W. Medbery, Lewis Greene Medbery, Frank P. Miller, Earl R. Moore, Geo. Siegfried Nelson, John Henry Nichols, Richard A. Nichols, Nathan A. Ogushewitz, Frank J. Davis, Peter C. Ophreay, Ernest E. Paulson, Charles J. Potter, Joseph Henry Prue, Leo Prue, Charles A. Reynolds, Walter E. Rosebrooks, Herman Rupprecht, Henry Elliott Savage, Paul LaF. Schwartz, William Singer, Edward J. Spinks, Merwyn H. Squires, John George Taylor, Alexander D. Telfer, Jesse J. Thompson, George R. Tormey, Geo. Safford Torrey, Jos. Ferdena Trudeau, Herbert N. Turner, Earl A. Whitehouse, Ernest J. Whitehouse, and Leland Amidon Wildes; Edward J. Spinks, Herbert N. Turner, and Leland Amidon Wildes died in service.