On August 3 there was an inconclusive engagement near Springfield, Missouri, another of those leading up to Wilson's Creek.
| Date | Engagement | Military Units | Losses | Victor |
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| April 12-14 | Fort Sumter, SC | Confederate artillery (Beauregard), Union garrison (Anderson) | None | CSA |
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| April 15 | Evacuation of Fort Sumter, SC | Union garrison | Two Union soldiers killed, four wounded by accidental explosion | N.A. |
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| April 19 | Baltimore Riots, MD | MA 6th, PA 26th vs secessionist crowd | 4 Union soldiers killed, 12 civilians killed, hundreds wounded | USA |
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| May 10 | St. Louis Riots, MO | Union forces vs secessionist crowd | 4 Union soldiers killed, 3 prisoners, 28 civilians killed | USA |
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| May 18-19 | Sewell's Point, VA | Union naval squadron vs Confederate shore artillery | 10 total | inconclusive |
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| May 29- June 1 | Aquila Creek, VA | Union naval squadron vs Confederate shore artillery | 10 total | inconclusive |
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| June 1 | Fairfax Court House, VA | detachments from CSA & USA armies | 8 on each side, 1 each killed | inconclusive |
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| June 3 | Philippi, WVA | Union Dept of Ohio (McClellan) -3,000, CSA infantry (Porterfield) -800 | Union 4, CSA 26 (killed or wounded) | USA |
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| June 10 | Big Bethel, VA | Union (Butler) -3,500, CSA (Magruder) -1,400 | Union 71-total (18-killed); CSA: 10-total (1-killed) | CSA |
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| 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 |
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| June 17 | Vienna, VA | Detachments from both Union & CSA armies | Union: 12-total (8 killed); CSA: none reported | CSA |
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| 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 |
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| 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 |
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| June 27 | Matthias' Point, VA | Union gunboats ~50 vs. Confed garrison ~500 | Union: 1-killed, 4-wounded; CSA none | CSA |
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| 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 |
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| 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 |
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| July 5 | Neosho, MO | Union 3rd Missouri vs. Confederate cavalry | Union: 137-total; CSA zero total | CSA |
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| July 8 | Laurel Hill, WVA | Union Dept of Ohio vs. Confederate Army of the Northwest | Union: 8-total; CSA unknown | USA |
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| 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 |
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| July 12 | Barboursville, WVA | Union 2nd Kentucky vs. Confederate rangers & locals | Union: 16-total; CSA 1-total | USA |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| July 22 | Forsyth, MO | Union Department of the West vs. Confederate Missouri State Guard | Union: 3-total ;Confederates: 15-total | USA |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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