Abraham Lincoln took the time to grant 5 pardons in July of 1861, following the disastrous showing of Federal troops in the Battle of the First Bull Run. In early 1862, he granted 7 pardons while his 11-year old son, Willie, suffered (and eventually died) from typhoid fever. Lincoln also granted 3 pardons during the week of the Battle of Gettysburg.
William McKinley granted 7 pardons the same month the United States declared war with Spain.
In May, June and July of 1894, while Grover Cleveland was dealing with the Pullman Strike, 32 pardons were granted.
Herbert Hoover granted 6 pardons the week following the great stock market crash of 1929.
Franklin Roosevelt granted 11 pardons in the week following the Japanese attack on Pearl Harbor. President Roosevelt also granted 38 pardons in the three days following the Normandy Invasion (D-Day).