Pls answer. who was the northerner who could out kill or outlast the enemy and won many battles for the union?

 The correct answer is :  Ulysses S. Grant

Explanation:  Grant was the 18th president of the United States. When the civil war began he was named commander in chief. In 1862 he launched an attack on the enemies and won the first victory of Union troops, for this reason he was promoted to general, commanding the troops achieved the final triumph in 1865 and was appointed secretary of war in the presidency of Andrew Johnson.