I find it kind of odd how the discussion/defense of Southern actions against United States property in the South never includes mention of threats of force, or force, or the word "surrender". It wasn't just Ft. Sumter either.
The Saint Louis Arsenal:
In March 1861, Lyon arrived in
St. Louis in command of Company B of the 2nd U.S. Infantry. At the time the population and state of Missouri were relatively neutral in the dispute between North and South, but Governor
Claiborne F. Jackson was a strong Southern sympathizer, as were many of the state legislators. Lyon was accurately concerned that Jackson meant to seize the
federal arsenal in St. Louis if the state seceded and that the Union had insufficient defensive forces to prevent the seizure. He attempted to strengthen the defenses, but came into opposition from his superiors, including
Brig. Gen. William S. Harney of the
Department of the West. Lyon employed his friendship with
Francis P. Blair, Jr., to have himself named commander of the arsenal. When the Civil War broke out and President
Abraham Lincoln called for troops to put down the
Confederacy, Missouri was asked to supply four regiments. Governor Jackson refused the request and ordered the
Missouri State Guard to muster outside St. Louis under the stated purpose of training for home defense.
[1]
Lyon himself had been extensively involved in the St. Louis
Wide Awakes, a pro-union
paramilitary organization that he intended to arm from the arsenal and muster into the ranks of the federal army. Upon obtaining command of the arsenal, Lyon armed the Wide Awake units under guise of night. Lyon had most of the excess weapons in the arsenal secretly moved to
Illinois. Lyon was aware of a clandestine operation whereby the Confederacy had shipped captured artillery from the U.S. arsenal in Baton Rouge to the Missouri State Militia camp in St. Louis. Lyon allegedly disguised himself as a farm woman to spy on the State Guard's camp and then claimed that he had uncovered a plan by Jackson to seize the arsenal for Missouri troops. On May 10 he directed the Missouri volunteer regiments and the 2nd U.S. Infantry to the camp, forcing its surrender. Riots broke out in St. Louis as Lyon marched his prisoners through the city to the St. Louis Arsenal. The event provoked the
Camp Jackson Affair of May 10, 1861, in which Lyons' troops opened fire on a crowd of civilians injuring at least 75 and killing 28.
[1] Two federals and three militia were also killed and others were wounded. The source of the first shot is disputed, some witnesses claiming it was a drunken rioter, others claiming it was unprovoked. Lyon was nonetheless promoted to
brigadier general May 17.
[5] and given command over the Union troops in Missouri May 31, 1861 as commander of the
Department of the West.
Being lazy I just nabbed that off Wiki. The next is from this link:
http://historyengine.richmond.edu/episodes/view/1286
After the Texas Convention met in January of 1861, the Committee on Public Safety sanctioned three men from this committee to confiscate property in Texas which belonged to the national government. General David E. Twiggs was in San Antonio when the commissioners paid a visit to take over the property. Twiggs stated that he would turn over the property and remove his troops from the state, although he would not formally agree to a contract in writing. The tensions between General Twiggs and the state paved the way for Ben McCulloch and his army of four hundred men, plus six hundred volunteers, to seize San Antonio on February 16th, 1861. General Twiggs was forced to surrender all federal property (about 3 million) and then left Texas; some of the federal property included: mules, wagons, horses, clothing, food, harnesses, iron, nails, and stores. He also handed over nineteen federal army posts. This event became the catalyst for the removal of 2,000 U.S. soldiers from Texas.
So we see a pattern of confiscation, threats of force, and in the second example, surrender.
Ft. Sumter? A United States installation first placed under siege and then bombarded by a South already in the act of Rebellion against the United States.