09/23/1863
https://www.presidency.ucsb.edu...
"Under the call for three-years' volunteers 50,000 men will be accepted as raised and reported by the respective State governors."
"You are also authorized to form a permanent corps of artificers, organized, officered, and equipped in such manner as you may prescribe;"
"You are hereby appointed chief of construction and transportation in the Department of the Rappahannock, with the rank of colonel, and attached to the staff of Major-General McDowell."
"You are also authorized to take possession of and use all railroads, engines, cars, buildings, machinery, and appurtenances within the geographical limits of the Department of the Rappahannock."