The Dahlgren Affair incensed Jefferson and the Confederate leadership. Combined with the desperate, dismal fortunes on the battlefield, the secret service was re-invigorated in 1864. It was involved in the 19 October 1864 St. Albans Raid in Vermont by personnel in Canada, the arson &lt;a href="Confederate%20Army%20of%20Manhattan"&gt;plans/attacks&lt;/a&gt; in northern cities, and future Kentucky governor Blackburn's biological warfare plot. Many historians believe the attempted John Wilkes Booth plots in the assassination of President Lincoln in August 1864 and April 1865 may have been connected to the secret service which was seen as reciprocation for the Stanton's Dahlgren orders. This is argued in the Edward Steers, Jr. book, "Blood on the Moon: The Assassination of Abraham Lincoln".