Bureau of Military Information
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Allan Pinkerton was contracted by Federal and a number of state and local governments to solve cases such as train robberies. In early 1861, Pinkerton assumed responsibility for Abraham Lincoln's safety, including gaining wind of an alleged assassination attempt.
Colonel Charles Pomeroy Stone also utilized a number of detectives. Starting in 1862, General Winfield Scott hired Lafayette C. Baker to provide him services similar to those Pinkerton provided McClellan. Lincoln hired William A. Lloyd to infiltrate the Confederacy and report directly to him at the cost of $200 a month plus expenses.
In all cases, the detectives and spies in question were civilians, despite the fact they reported to military heads and served in wartime (Pinkerton, however, created an alias that was a Union Army major). They also reported directly to and were paid at the leisure of their superiors, not to any military or government agency, and in fact, Pinkerton and Baker's organizations actively competed against one another, to the point of arresting each other's agents to maintain an upper hand. After the war, both Pinkerton and Baker claimed to have held the position of "Chief of the United States Secret Service." However, none of the above are considered to be a true intelligence agency.
Bureau of Military Information
On January 26, 1863, Major General Joseph Hooker was given command of the Army of the Potomac. One of his first orders was for his deputy provost marshal, Colonel George H. Sharpe, to establish an intelligence unit. Sharpe was assisted by John C. Babcock, a civilian and former employee of Pinkerton. On February 11, 1863, they established the Bureau of Military Information.
The BMI utilized around 70 field agents during the war, ten of whom were killed. In addition to field agents, information was gathered through interrogation of prisoners of war and refugees, newspapers, and documents left on the battlefield by Confederate officers who has retreated or been killed.
In July, 1864, Commanding General Ulysses S. Grant, in preparation of the campaign to capture Richmond, stationed Sharpe and the BMI staff into his command headquarters, in order to ensure he would have the most up to date knowledge of the battlefield. Sharpe and BMI continued to serve Grant up until the Battle of Appomattox Court House, where they were responsible for paroling the former members of the Army of Northern Virginia, including Robert E. Lee himself.
The BMI was disbanded in 1865, at the end of the Civil War. The United States would not create another formal intelligence agency until the Office of Naval Intelligence in 1882. The Army would create its Military Intelligence Division in 1885, which would become the predecessor of the Military Intelligence Corps and United States Army Intelligence and Security Command.
Following Lincoln's assassination, Baker would be responsible for tracking down the conspirators, but would eventually be dismissed by Andrew Johnson due to allegedly spying on the President himself for Edwin M. Stanton. Baker would also hunt for Lincoln's conspirators, this time in Europe as a special agent of the United States Department of State. After being elected President of the United States, Grant appointed Sharpe as United States Marshal for the Southern District of New York where he helped root out corruption, including disbanding the Tweed Ring.
- Linedecker, Clifford L., ed. Civil War, A-Z: The Complete Handbook of America's Bloodiest Conflict. New York: Ballantine Books, 2002. ISBN 0-89141-878-4
- United States Government, Intelligence in the Civil War. Washington, D.C., Central Intelligence Agency, 2005.
- The FBI: A Comprehensive Reference Guide