James Abram Garfield

James Abram Garfield (November 19, 1831 – September 19, 1881) was the 20th president of the United States, serving from March to September 1881. Garfield was shot by an assassin four months into his presidency and died two months later. He is the only sitting member of the United States House of Representatives to be elected to the presidency.
On January 9, 1862, in the Battle of Middle Creek, the only pitched battle Garfield personally commanded. At the fighting's end, the Confederates withdrew from the field.
In recognition of his success, Garfield was promoted to brigadier general. Garfield's command was the sole remaining Union force in eastern Kentucky, and he announced that any men who had fought for the Confederacy would be granted amnesty if they returned to their homes and lived peaceably and remained loyal to the Union.
https://en.wikipedia.org/wiki/James_A._Garfield