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Major General William Rosecrans commanded the Union Army at the Battle of Chickamauga.
Vicksburg. It ended the war in the West, liberated the Mississippi, and enabled Grant to go to the aid of the Army of the Cumberland at Chattanooga.
The Battle of Fredericksburg was the worst defeat for the Union Army. It was General Ambrose Burnside's fault.
Major General William Starke Rosencrans for the Union Army of the Cumberland and Lt. General Braxton Bragg for the Confederate Army of Tennessee.
The Battle of Camden was fought in the American colony of New Jersey. It was fought between the British Army and the Continental Army of the British colony in North America.
Chancellorsville
Chancellorsville
George Meade commanded the Army of the Potomac.
Chancellorsville
Meade commanded the army of the Potomac.
Chancellorsville.
Chancellorsville
I believe General Meade was in command of the Union's Army of the Potomac.
Gettysburg
The Northern army was called the Army of the Potomac and was under the command of General George G. Meade.
In 1862 the Battle of Fredericksburg, Virginia, pitted the Army of Northern Virginia against the Army of the Potomac. General Robert E. Lee commanded the former army and General Ambrose Burnside commanded the latter army. As it turned out, it was a rushing defeat for the North and it premier army, the Army of the Potomac.
Since the Confederate General Pemberton surrendered the city to General Grant of the Union Army, I suspect the Union claimed victory.