News filtered back that a soldier from Seneca Falls and his men did good work building a bridge for the Army of the Potomac in June. From a Seneca County, New York newspaper in July 1864:
THE 50TH N.Y. ENGINEERS. – A correspondent of the Rochester Union with the 50th N.Y. Engineers, gives quite an interesting account of the building of a bridge across the Chickahominy on the 12th ult., by the 3d battalion of the 50th Engineers, including Co. K., the whole under the command of Capt. JAS. H. MCDONALD, of this village, now acting major of the regiment.
You can read an overview of the 50th’s work during the Overland Campaign at To the Sound of the Guns. According to a chart Major George W. Ford was the “Officer in command of train” for both bridges built on June 12th.