Ulysses S. Grant & William T. Sherman 
Civil War Memoirs: Grant and Sherman 

According to Wikipedia: 'Ulysses S. Grant (born Hiram Ulysses Grant; April 27, 1822 – July 23, 1885) was the 18th President of the United States (1869–1877) and military commander during the Civil War and post-war Reconstruction. Under Grant, the Union Army defeated the Confederate military and effectively ended the war with the surrender of the Confederate Army of Northern Virginia at Appomattox.’ 'William Tecumseh Sherman (February 8, 1820 – February 14, 1891) was an American soldier, businessman, educator and author. He served as a General in the Union Army during the American Civil War (1861–65), for which he received recognition for his outstanding command of military strategy as well as criticism for the harshness of the 'scorched earth’ policies that he implemented in conducting total war against the Confederate States. Military historian B. H. Liddell Hart famously declared that Sherman was 'the first modern general’.