The ten costliest land battles of Civil War Battles, measured by casualties (killed, wounded, captured, and missing) were:

Battle (State) Date Confederate
Commander		 Union Commander Conf. Forces Union Forces Casualties
Battle of Gettysburg

(Pennsylvania)

 July 1–3, 1863 Robert E. Lee George Meade 71,699 94,589 51,112
U: 23,049
C: 28,063
Battle of Chickamauga

(Georgia)

 September 19–20, 1863 Braxton Bragg William Rosecrans 75,357 61,753 34,624
U: 16,170
C: 18,454
Battle of Chancellorsville

(Virginia)

 May 1–4, 1863 Robert E. Lee Joseph Hooker 60,892 133,868 30,099
U: 17,278
C: 12,821
Battle of Spotsylvania Court House

(Virginia)

 May 8 –21, 1864 Robert E. Lee Ulysses S. Grant 52,000 100,000 30,399
U: 18,399
C: 12,000
Battle of Antietam

(Maryland)

 September 17, 1862 Robert E. Lee George B. McClellan 65,000 82,654 23,134
U: 12,410
C: 10,724
Battle of Wilderness

(Virginia)

 May 5–7, 1864 Robert E. Lee Ulysses S. Grant 61,025 101,895 28,666
U: 17,666
C: 11,000
Second Battle of Bull Run

(Virginia)

 August 29–30, 1862 Robert E. Lee John Pope 48,527 79,862 25,251
U: 16,054
C: 9,197
Battle of Stones River

(Tennessee)

 December 31, 1862 Braxton Bragg William Rosecrans 44,330 54,448 24,645
U: 12,906
C: 11,739
Battle of Shiloh

(Tennessee)

 April 6–7, 1862 Albert Sidney Johnston
P. G. T. Beauregard		 Ulysses S. Grant 44,968 65,085 23,741
U: 13,047
C: 10,694
Battle of Fort Donelson

(Tennessee)

 February 13–16, 1862 John B. Floyd
Simon Bolivar Buckner, Sr.		 Ulysses S. Grant 12,110 20,057 19,455
U: 2,832
C: 16,623