| November 6, 1860 |
Abraham Lincoln elected 16th President of the United States. |
| November 6, 1860 |
Claiborne Fox Jackson elected Governor of Missouri. |
| November 6, 1860 |
Francis P. Blair, Jr. elected Congressman from Missouri's 1st District. |
| January 3, 1861 |
Claiborne Fox Jackson takes office as the 15th Governor of Missouri. |
| January 29, 1861 |
Captain Nathaniel Lyon, commanding Fort Scott, ordered to St. Louis Arsenal. |
| March 4, 1861 |
Abraham Lincoln is inaugurated as President of the United States of America. |
| April 12, 1861 |
Confederate forces under the command of Brigadier General P.G.T. Beauregard fire on Fort Sumter. |
| April 15, 1861 |
President Abraham Lincoln issues a proclamation calling up 75,000 militia for three months service. |
| April 17, 1861 |
Missouri Governor Claiborne Fox Jackson ccondemns President Lincoln's call for volunteers and refuses to comply. |
| April 20, 1861 |
United States Arsenal in Liberty, Missouri seized by pro-Southern forces. |
| May 4, 1861. |
United States ordnance stores in Kansas City, Missouri seized by pro-Southern forces. |
| May 10, 1861 |
The Camp Jackson Affair - Union forces under the command of Brigadier-General Nathaniel Lyon surround and force the surrender of Missouri State Guard forces encamped just outside of St. Louis, Missouri. |
| May 11, 1861 |
The St. Louis Riot - The Fifth Regiment, US Reserve Corps was attacked by a civilian mob near the corner of Broadway and Walnut Streets. |
| May 12, 1861 |
Missouri Governor Claiborne Fox Jackson appoints Sterling Price as the commander of the Missouri State Guard. |
| May 21, 1861 |
Convention between US Army Brigadier General William S. Harney and Missouri State Guard Major General Sterling Price. |
| May 31, 1861 |
Brigadier-General Nathaniel Lyon assumes command of the Department of the West, replacing General Harney. |
| June 11, 1861 |
To preserve the peace in Missouri, Brigadier General Nathaniel Lyon, Congressman Francis P. Blair, Jr., Major General Sterling Price and Missouri Governor Claiborne Fox Jackson meet in St. Louis. After several hours of contentious discussion, Lyon declares war on Governor Jackson and the Missouri State Guard and storms out of the meeting. |
| June 13, 1861 |
Federal forces under the command of Brigadier General Nathaniel Lyon occupy Jefferson City sending the state government and Missouri Governor Claiborne Fox Jackson into exile. |
| June 17, 1861 |
The Battle of Boonville - In command of Union forces, Brigadier General Nathaniel Lyon takes possession of Boonville at 11:00 A.M. after routing the Missouri State Guard defenders under the command of Colonel John S. Marmaduke. The Missouri State Guard retreats to southwestern Missouri.
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