It was an attempted insurrection...
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Insurrection
A rising or rebellion of citizens against their government, usually manifested by acts of violence.
Under federal law, it is a crime to incite, assist, or engage in such conduct against the United States.
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5.-3. That whenever it may be necessary, in the judgment of the president, to use the military force hereby directed to be called forth, the president shall forthwith, by proclamation, command such insurgents to disperse, and retire peaceably to their respective abodes, within a limited time.
Insurrection legal definition of Insurrection (thefreedictionary.com)