Born on this day was Alan Pinkerton,
The prototype of the Private Eye.
Guarded in Baltimore by him and his men,
Lincoln was spared the assassin's try.*
It happened on February 23, 1861: "Allen Pinkerton, head of a private detective agency, had uncovered a plot to assassinate Lincoln when he passed through Baltimore on his way to the capital. Lincoln and his advisors disagreed about how to respond to the threat. Some, including Pinkerton, wanted Lincoln to slip secretly into Washington, which would mean skipping an address to the Pennsylvania legislature in Harrisburg. Lincoln did not want to appear cowardly, but felt the threats were serious.
Lincoln agreed to the covert arrival. With Pinkerton and Ward Hill Lamon, his former law partner, Lincoln slipped out of the hotel in Harrisburg on the evening of February 22. He wore a soft felt hat instead of his customary stovepipe hat, and draped an overcoat over his shoulders and hunched slightly to disguise his height. The group boarded a sleeper car and arrived in Baltimore in the middle of the night. They slipped undetected from the Calvert Street station to Camden station across town. There, they boarded another train and arrived without incident in Washington at 6 a.m." [History.com]