12/21/1863
https://www.presidency.ucsb.edu...
"Second Corps to consist of three divisions, and to be commanded by Brigadier-General E. V. Sumner."
"Third Corps to consist of three divisions, and to be commanded by Brigadier-General S. P. Heintzelman."
"Fourth Corps to consist of three divisions, and to be commanded by Brigadier-General E. D. Keyes."
"No more than two army corps (about 50,000 troops) of said Army of the Potomac shall be moved en route for a new base of operations until the navigation of the Potomac from Washington to the Chesapeake..."