When Virginia refused to provide militia when President Lincoln requested them they were in violation of the constitution.
Is a "combination" (for which Pres. Lincoln called forth the militia) the same thing as an insurrection?
the militia law of 1795 suggests not necessarily. Its first section mentions insurrections..."in any State against the government thereof..."
and Sec. 2 "combinations" like that Lincoln called to suppress... were those opposed to the function of US laws in the States...
Militia officers who did not accomodate the President's lawful orders:
The above was the law in May, 1861 when the State of Virginia ratified its ordinance of secession.
The USA act of July 13, 1861 states the "combination" in the Southern States was composed of insurrectionists, and that the President could declare the people of those States in insurrection...
In August, 1861, Pres. Lincoln proclaimed the people of eastern Virginia in insurrection, including Gen. Lee.