The city of Montreal , at the time , was leaning with sympathies towards both sides of the American conflict . The streets were filled with spies from both sides , exiled Confederates of high rank , sympathizers , arms dealers , Union detectives and saboteurs . Carroll became a fixture at the luxurious St. Lawrence Hall on St. James Street ( now Saint Jacques Street ) which was where the more affluent Confederates in Canada stayed such as Jacob Thompson , Clement Claiborne Clay , James Westcott , Moses Montrose Pallen , Luke P. Blackburn , Nathaniel Beverly Tucker and even John Wilkes Booth . Many plots were formed by the members of this group . After staying in Montreal for a time , Carroll sailed south and was captured off the coast of North Carolina . He was placed in prison in Fortress Monroe , and was quickly released and forced to return to Montreal , Quebec . On June 8 , 1865 , Carroll and a friend named O'Donnell confronted Sandford Conover in front of the William Ennis saloon . They demanded to know whether he was using the alias James Watson Wallace , the man who had spun the web of false testimony towards the Assassination of Abraham Lincoln . Carroll accepted the affidavit swearing his innocence , later explaining it in great detail to Andrew Johnson
Assassination of Abraham Lincoln
Assassination of Abraham Lincoln
William Henry Carroll