 The fugitives then continued southward , stopping before dawn on April 15 at the home of Dr. Samuel Mudd , St. Catharine , 25 miles ( 40 km ) from Washington , for treatment of Booth 's injured leg . Mudd later said that Booth told him the injury occurred when his horse fell . The next day , Booth and Herold arrived at the home of Samuel Cox around 4 a.m. As the two fugitives hid in the woods nearby , Cox contacted Thomas A. Jones , his foster brother and a Confederate agent in charge of spy operations in the southern Maryland area since 1862 . By order of Secretary of War Edwin M. Stanton , the War Department advertised a $ 100 @,@ 000 reward ( $ 1 @.@ 55 million in 2016 USD ) for information leading to the arrest of Booth and his accomplices , and Federal troops were dispatched to search southern Maryland extensively , following tips reported by Federal intelligence agents to Col. Lafayette Baker . 
