This is an incomplete list of all military confrontations that have occurred within the boundaries of the modern U.S. state of Missouri since European contact.
| Name | Date | Location | War | Strength | Casualties | Belligerents | Victor | Ref. |
|---|---|---|---|---|---|---|---|---|
| St. Louis | May 25, 1780 | St. Louis | American Revolutionary War | Spain-320, Great Britain-~1,500 | 108 | Spain vs. Great Britain & Indian tribes | Spanish victory | |
| Sink Hole | May 24, 1815 | Lincoln County | War of 1812 | ? | 8 | Sauk vs. United States | United States victory | |
| Battle Creek | July 1829 | Schuyler County | American Indian Wars | ? | ? | Iowa vs. American settlers | United States victory | |
| Gallatin | August 6, 1838 | Gallatin | Missouri Mormon War | Mormon-?, Missouri Citizens-200 | ? | Latter-Day Saints vs. Missouri citizens | Citizens victory | |
| Crooked River | October 28, 1838 | Crooked River | Missouri Mormon War | Mormon-?, Missouri State Militia-1 division | 4 | Latter-Day Saints vs. Missouri State Militia | Latter-Day Saints victory | |
| Haun's Mill | October 30, 1838 | Caldwell County | Missouri Mormon War | Mormon-?, Missouri State Militia-240 | 21 | Latter-Day Saints vs. Missouri State Militia | Missouri victory | |
| 1st Boonville | June 17, 1861 | Boonville | American Civil War | Union-1,700, Missouri State Guard-~1,500 | 10 KIA, 17 WIA, 80 POW | United States vs. Missouri (Confederate) | Union victory | |
| Cole Camp | June 19, 1861 | Benton County | American Civil War | Benton County Home Guard-600, Missouri State Guard-300 | 43 KIA, 85 WIA, 25 POW | United States vs. Missouri (Confederate) | Confederate victory | |
| Carthage | July 5, 1861 | Near Carthage | American Civil War | Union-1,100, Missouri State Guard-6,000 | 244 | United States vs. Missouri (Confederate) | Confederate victory | |
| Dug Springs | August 2, 1861 | Near Clever | American Civil War | ? | 48 KIA, 74 WIA | United States vs. Missouri (Confederate) | Union victory | |
| Athens | August 5, 1861 | Clark County | American Civil War | Home Guard-333-500, Missouri State Guard-~2,000 men plus 3 cannon | 3 KIA, 20 WIA, 31 KIA & WIA | United States vs. Missouri (Confederate) | Union victory | |
| Wilson's Creek | August 10, 1861 | Christian and Greene counties | American Civil War | Union-5,430, Missouri State Guard-12,120 | 535 KIA, 1808 WIA, 196 MIA | United States vs. Missouri (Confederate) | Confederate victory | |
| Charleston | August 19, 1861 | Charleston | American Civil War | Union-250, Confederate-500 | ? | United States vs. Confederate States | Union victory | |
| Dry Wood Creek | September 2, 1861 | Vernon County | American Civil War | Union-600, Missouri State Guard-? | 18 KIA, 16 WIA | United States vs. Missouri (Confederate) | Confederate victory | |
| 2nd Boonville | September 13, 1861 | Boonville | American Civil War | Boonville Home Guardsmen-140, Missouri State Guard-800 | United States vs. Missouri (Confederate) | Union victory | ||
| 1st Lexington | September 13–20, 1861 | Lexington | American Civil War | Lexington Garrison-3,500 Missouri State Guard-15,000 | 800 KIA, 1,000 POW | United States vs. Missouri (Confederate) | Confederate victory | |
| Blue Mills Landing | September 17, 1861 | Clay County | American Civil War | Union-600, Missouri State Guard-3,500 | 126 | United States vs. Missouri (Confederate) | Confederate victory | |
| Fredericktown | October 21, 1861 | Madison County | American Civil War | Union-2,500, Confederacy-? | 25 KIA, 40 WIA, 80 POW | United States vs. Confederate States | Union victory | |
| 1st Springfield | October 25, 1861 | Springfield | American Civil War | Union-326 Confederacy-1,500 | 218 | United States vs. Confederate States | Union victory | |
| Belmont | November 7, 1861 | Mississippi County | American Civil War | Union-3,114, Confederacy-~ 5,000 | 225 KIA, 727 WIA, 221 POW/MIA | United States vs. Confederate States | Indecisive | |
| Blackwater Creek | December 19, 1861 | Johnson County | American Civil War | Union-4,000, Confederacy-750 | 694 | United States vs. Confederate States | Union victory | |
| Mount Zion Church | December 28, 1861 | Boone County | American Civil War | Union-440, Confederacy-~ 900 | 27 KIA, 213 WIA, 64 POW | United States vs. Confederate States | Union victory | |
| Roan's Tan Yard | January 8, 1862 | Randolph County | American Civil War | Union-450, Confederacy-800 | 46 KIA, 99 WIA, 28 POW | United States vs. Confederate States | Union victory | |
| New Madrid | February 28, 1862 – April 8, 1862 | New Madrid | American Civil War | Union-6 gunboats 11 mortar rafts, Confederacy-~ 7,000 | 53 KIA, 50 WIA, 5 MIA, 7,000 POW | United States vs. Confederate States | Union victory | |
| Moore's Mill | July 28, 1862 | Callaway County | American Civil War | Union-733, Confederacy-260-350 | 13 KIA, 55 WIA, 202 KIA/WIA | United States vs. Confederate States | Union victory | |
| Cravensville | August 5, 1862 | Daviess County | American Civil War | Union-35, Confederacy-85 | Union 5 wounded Confederates 8 killed 10 wounded | United States vs. Confederate States | Union victory | |
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| Kirksville | August 6, 1862 | Adair County | American Civil War | Union-1,000, Confederacy-2,500 | 456 | United States vs. Confederate States | Union victory | |
| Compton's Ferry | August 11, 1862 | Livingston County | American Civil War | Union-?, Confederacy-~ 1,500 | ? | United States vs. Confederate States | Union victory | |
| Independence | August 11, 1862 | Independence | American Civil War | Union-344, Confederacy-~800 | 344 | United States vs. Confederate States | Confederate victory | |
| Yellow Creek | August 13, 1862 | Chariton County | American Civil War | Union-~700, Confederacy-Unknown | 2 WIA, Confederate-? | United States vs. Confederate States | Union victory | |
| Lone Jack | August 15–16, 1862 | Jackson County | American Civil War | Union-800, Confederacy-1,500-3,000 | 270 | United States vs. Confederate States | Confederate victory | |
| 1st Newtonia | September 30, 1862 | Newtonia | American Civil War | Union-1,500 Confederacy-1 brigade | 345 | United States vs. Confederate States | Confederate victory | |
| Island Mound | October 29, 1862 | Bates County | American Civil War | Union-250, Confederacy-350 | 19 | United States vs. Confederate States | Union victory | |
| Clark's Mill | November 7, 1862 | Douglas County | American Civil War | Union-113, Confederacy-1,000 | 113 | United States vs. Confederate States | Confederate victory | |
| 2nd Springfield | January 8, 1863 | Springfield | American Civil War | Union-2,099, Confederacy-1,870 | 521 | United States vs. Confederate States | Union victory | |
| Hartville | January 9–11, 1863 | Wright County | American Civil War | Union-750, Confederacy- ? | 19 KIA, 160 WIA, 10 MIA/POW | United States vs. Confederate States | Indecisive | |
| Cape Girardeau | April 26, 1863 | Cape Girardeau County | American Civil War | Union-4,000, Confederacy- 5,000 | 337 | United States vs. Confederate States | Union victory | |
| Chalk Bluff | May 1–2, 1863 | Dunklin County | American Civil War | Union-120, Confederacy- 210 | 53 KIA, 104 WIA, 120 MIA, 53 POW | United States vs. Confederate States | Confederate pyrrhic victory | |
| 3rd Boonville | October 11, 1863 | Boonville | American Civil War | ? | ? | United States vs. Confederate States | Union victory | |
| Camden Point | July 13, 1864 | Camden Point | American Civil War | Union-1,000, Confederacy- 300 | 6 KIA, 25 WIA | United States vs. Confederate States | Union victory | |
| Fort Davidson | September 27, 1864 | Iron County | American Civil War | Union-1,500, Confederacy- 12,000 | 1,684 | United States vs. Confederate States | Union victory | |
| 4th Boonville | October 11, 1864 | Boonville | American Civil War | ? | ? | United States vs. Missouri (Confederate) | Confederate victory | |
| Glasgow | October 15, 1864 | Glasgow | American Civil War | Union-800, Confederacy-1,800 | 450 | United States vs. Confederate States | Confederate victory | |
| Sedalia | October 15, 1864 | Sedalia | American Civil War | Union-~800, Confederacy-~1,200 | 1 | United States vs. Confederate States | Confederate victory | |
| 2nd Lexington | October 19, 1864 | Lexington | American Civil War | Union-2,000 Confederacy-8,500 | ? | United States vs. Confederate States | Confederate victory | |
| Little Blue | October 21, 1864 | Jackson County | American Civil War | Union-2,500, Confederacy- 8,500 | ? | United States vs. Confederate States | Confederate victory | |
| Independence | October 21–22, 1864 | Independence | American Civil War | Union-22,000, Confederacy-8,500 | 140 | United States vs. Confederate States | Confederate victory | |
| Big Blue | October 22–23, 1864 | Kansas City | American Civil War | Union-2 divisions, Confederacy-2 divisions | ? | United States vs. Confederate States | Union victory | |
| Westport | October 23, 1864 | Westport | American Civil War | Union-22,000, Confederacy- 8,500 | 3,000 | United States vs. Confederate States | Union victory | |
| Charlot | October 25, 1864 | Vernon County | American Civil War | Union-2 brigades, Confederacy- 1 division | ? | United States vs. Confederate States | Union victory | |
| 2nd Newtonia | October 28, 1864 | Newtonia | American Civil War | Union-? Confederacy-? | 650 | United States vs. Confederate States | Union victory | [1] |