11/20/1862
https://www.presidency.ucsb.edu...
"All officers and persons in the military, naval, and revenue services, or in any branch of the public service under the authority of the United States Government, are required, upon subpoena issued by..."
"The Secretary of War shall assign to the said commissioners such aid and assistance as may be required for the performance of their duties, and make such just and reasonable allowances and compensatio..."
"Ordered, first. That Major-General William F. Smith and the Hon. Henry Stanbery be, and they are hereby, appointed special commissioners to investigate and report, for the information of the President..."
"Said special commissioners shall also investigate and report upon any other matters that may hereafter be directed by the Secretary of War, and shall with all convenient dispatch make report to him in..."