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William McKinley was the 25th President of the United States. McKinley also served an officer in the Union army during the Civil War, represented Ohio in the U.S. House of Representatives, and served as Governor of Ohio.

Key facts about William McKinley, Jr., twenty-fifth President of the United States.

Commander of the Army of the Tennessee, Major General James Birdseye McPherson was killed during the Battle of Atlanta on July 22, 1864.

Key facts about Major General James Birdseye McPherson who was killed while commanding the Army of the Tennessee during the Battle of Atlanta on July 22, 1864.

Victorious commander at the Battle of Gettysburg, Major General George G. Meade commanded the Army of the Potomac throughout the Gettysburg, Bristoe, Mine Run, Overland, Petersburg, and Appomattox Campaigns.

APUSH Definition — George Meade (1815–1872) was an officer in the United States Army during the Civil War. He was one of the most important Union commanders during the war and is most well-known for leading the Union Army to victory at the Battle of Gettysburg.

A lieutenant in the Union army and later a major in the Confederate army, Richard K. Meade was one of four graduates of the U.S. Military Academy who initially fought for the Union before switching sides during the American Civil War.

Key facts about Richard K. Meade, one of four West Point graduates to fight for the Union during the Civil War before switching sides.

Samuel Medary was a newspaper publisher during the American Civil War, His newspaper, the Crisis, was a nationally prominent voice for Peace Democrats.

Key facts about Samuel Medary, an Ohio newspaper publisher during the American Civil War who was a nationally prominent voice for Peace Democrats.

Mercantilism — or the Mercantile System — was an economic theory followed by England that helped lead to the implementation of policies that contributed to the unrest in the American Colonies and to the American Revolution and American Revolutionary War.

General Hugh Mercer was an officer in the Continental Army during the American Revolutionary War. He fought in the early battles of the New York-New Jersey Campaign and was mortally wounded at the Battle of Princeton.

Union General William T. Sherman's Meridian Campaign served as a modest rehearsal for his later "March to the Sea" in Georgia, and the Carolinas Campaign, by spreading a path of destruction across central Mississippi in early 1864.

Facts and details about the Battle of Meridian, which was a campaign of destruction carried out against the town of Meridian, Mississippi by Union troops under the command of Major General William T. Sherman from February 14–20, 1864.

The Battle of Meridian was a campaign of destruction carried out against the town of Meridian, Mississippi by Union troops under the command of Major General William T. Sherman from February 14–20, 1864.

On February 1, 1865, Samuel Cooper, Adjutant and Inspector General (CSA) informed Robert E. Lee that the Confederate Senate had confirmed his appointment as general-in-chief of the Armies of the Confederacy.

On May 15, 1861, the Confederate War Department informed newly-appointed Brigadier General Joseph E. Johnston that he was assigned to command the troops near Harpers Ferry, Virginia.

On April 27, 1861, Robert E. Lee ordered Colonel Thomas J. Jackson to take command of Harpers Ferry, Virginia.

On October 28, 1864, CSA Secretary of War James Seddon announced the appointment of William J. Hardee (pictured here) as commander of the Department of South Carolina, Georgia, and Florida.

On June 27, 1862, Confederate General Braxton Bragg issued a message announcing that he was taking permanent command of the Army of the Mississippi.