Total casualties in the Civil War "now" top 10,000 of which around 1,700 are killed.
| Date | Engagement | Military Units | Losses | Victor |
|---|---|---|---|---|
| April 12-14 | Fort Sumter, SC | Confederate artillery (Beauregard), Union garrison (Anderson) | None | CSA |
| April 15 | Evacuation of Fort Sumter, SC | Union garrison | Two Union soldiers killed, four wounded by accidental explosion | N.A. |
| April 19 | Baltimore Riots, MD | MA 6th, PA 26th vs secessionist crowd | 4 Union soldiers killed, 12 civilians killed, hundreds wounded | USA |
| May 10 | St. Louis Riots, MO | Union forces vs secessionist crowd | 4 Union soldiers killed, 3 prisoners, 28 civilians killed | USA |
| May 18-19 | Sewell's Point, VA | Union naval squadron vs Confederate shore artillery | 10 total | inconclusive |
| May 29- June 1 | Aquila Creek, VA | Union naval squadron vs Confederate shore artillery | 10 total | inconclusive |
| June 1 | Fairfax Court House, VA | detachments from CSA & USA armies | 8 on each side, 1 each killed | inconclusive |
| June 3 | Philippi, WVA | Union Dept of Ohio (McClellan) -3,000, CSA infantry (Porterfield) -800 | Union 4, CSA 26 (killed or wounded) | USA |
| June 10 | Big Bethel, VA | Union (Butler) -3,500, CSA (Magruder) -1,400 | Union 71-total (18-killed); CSA: 10-total (1-killed) | CSA |
| June 15 | Hooe's Ferry (near Mathias Point) VA | Union schooner Christina Keen; CSA Farmer's Fork Grays | none -- Christina Keen captured and burned | CSA |
| June 17 | Vienna, VA | Detachments from both Union & CSA armies | Union: 12-total (8 killed); CSA: none reported | CSA |
| June 17 | Boonville, MO | Union Western Dept (Lyon) -1,700 vs. MO State Guard (Marmaduke) ~1,500 | Union: 12-total (5-killed); MO Guard 22-total (5-killed) | USA |
| June 18 | Camp Cole, MO | Union Home Guards (~500) vs. Confederate State Guards (~350) | Union: 120-total (35 killed, 60 wounded 25 captured); CSA: 32-total ( 7-K, 25-W) | CSA |
| June 27 | Matthias' Point, VA | Union gunboats ~50 vs. Confed garrison ~500 | Union: 1-killed, 4-wounded; CSA none | CSA |
| July 2 | Hoke's Run, WVA | Union Army of the Shenandoah (2 brigades, Patterson) -8,000 vs. Confederate Army of the Shenandoah (1 brigade, Stonewall Jackson) - 4,000 | Union: 70-total (3-killed); CSA 23-total ( 9-killed) | USA |
| July 5 | Carthage, MO | Union Department of the West (Sigel) -- 1,000 vs. Confederate Missouri State Guard (Jackson) -- 4,000 | Union: 44-total; CSA 200-total | CSA |
| July 5 | Neosho, MO | Union 3rd Missouri vs. Confederate cavalry | Union: 137-total; CSA zero total | CSA |
| July 8 | Laurel Hill, WVA | Union Dept of Ohio vs. Confederate Army of the Northwest | Union: 8-total; CSA unknown | USA |
| July 11 | Rich Mountain, WVA | Union Department of the Ohio (McClellan & Rosecrans) -7,000 vs. Confederate Army (Pegram & Garnett) -1,300 | Union: 46-total; CSA 300-total | USA |
| July 12 | Barboursville, WVA | Union 2nd Kentucky vs. Confederate rangers & locals | Union: 16-total; CSA 1-total | USA |
| July 13 | Corrick's Ford, WVA | Union Department of the Ohio (McClellan & Rosecrans) -20,000 vs. Confederate Army (Garnett) -4,500 | Union: 53-total; CSA 620-total CSA Gen. Garnett killed | USA |
| July 17 | Scary Creek, WVA | Union Department of the Ohio (Cox) -1,000 vs. Confederate Army of the Kanawha (Wise & George S. Patton) -800 | Union: 51-total; CSA 10-total including Patton wounded | CSA |
| July 18 | Blackburn's Ford, VA (pre-Manassas) | Union Department of NE Virginia (McDowell, Richardson) -3,000 vs. Confederate Army of VA (Beauregard, Longstreet) -5,100 | Union: 83-total; CSA 70-total | CSA |
| July 21 | Bull Run/Manassas, VA | Union Department of NE Virginia (McDowell, Patterson) -54,000 (18,000 engaged) vs. Confederate Army of VA (Beauregard, Longstreet) -34,000 (18,000 engaged) | Union: 2,708-total (481-killed); CSA 1,897-total (387-killed) | CSA |
| July 22 | Forsyth, MO | Union Department of the West vs. Confederate Missouri State Guard | Union: 3-total ;Confederates: 15-total | USA |
| July 25 | Mesilla, New Mexico | Union Department of the New Mexico (~300) vs. Confederate 2nd Texas Mounted Rifles (~380 +artillery ) | Union: 9-total (2-killed); Confederates: 19-total (13-killed) | CSA |
| July 27 | Fort Fillmore, NM | Union Department of the New Mexico (~500) vs. Confederate 2nd Texas Mounted Rifles (~300) | Union: 500-total (surrendered); Confederates: none | CSA |
| Aug 2 | Dug Springs, MO (leadup to Wilson's Creek) | Union Department of the West (~6,000) vs. Confederate Missouri State Guard (~12,000) | Union: 38-total (8 killed ); Confederates:84-total (40 killed) | USA |
| Aug 3 | Curran Post Office, MO (leadup to Wilson's Creek) | Union Department of the West (~6,000) vs. Confederate 1st Arkansas Rifles | Unknown | inconclusive |
| Aug 5 | Athens, MO | Union 21st MO Infantry, Home Guards (~500) vs. Confederate Missouri State Guard (~2,000 + 3-cannons) | Union 23-total (3-killed); Confederate 31-total | USA |
| Aug 7 | CSA burned Hampton, VA | Union (Butler) vs. Confederate Cavalry (Magruder) | Union unknown; Confederates unknown | CSA |
| Aug 8 | skirmish at Lovettsville, VA | Union vs. Confederate | Union unknown; Confederates 6-total | USA |
| Aug 10 | Wilson's Creek, MO | Union Dept of the West (Lyon -5,430)vs. Confederate MO State Guard, Dept 2 (Price -12,120) | Union 1,317-total (285-killed); Confederates 1.232-total (277-killed) | CSA |
| Aug 10 | Potosi, MO | Union Home Guard (~75 troops) vs. Confederate cavalry (~120 troops) | Union 5-total (1-killed); Confederates 5-total (2-killed) | USA |