Attached to Engineer Brigade, Army Potomac, all through. Participated in the following service: Duty in the Defences of Washington till March, 1862. Peninsula Campaign April to August, 1862. Siege of Yorktown April 5-May 4. Seven days before Richmond June 25-July 1. Battles of Mechanicsville June 26; Gaines' Mill June 27; Turkey Bridge June 30; Malvern Hill July 1; Antietam, Md., September 16-17. Fredericksburg, Va., "Mud March," January 20-24, 1863. Chancellorsville Campaign April 27-May 6. Battle of Chancellorsville May 1-5. Gettysburg (Pa.) Campaign June 11-July 24. Battle of Gettysburg, Pa., July 1-4. Bristoe Campaign October 9-22. Advance to line of the Rappahannock November 7-8. Mine Run Campaign November 26-December 2. Rapidan Campaign May 4-June 12. Battles of the Wilderness May 5-7; Spottsylvania Court House May 8-21. North Anna River May 22-26. On line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Before Petersburg June 16-18. Siege of Petersburg June 16, 1864, to April 2, 1865. Fall of Petersburg April 2.