During the "lame duck" period of Buchanan, in the run-up to the civil war; how many US officials and officers where actively working to supply what was to be the CSA?

by dirtyoldmikegza

in reading up on Civil war Generals i stumbled upon the name of Samuel Cooper who by date of rank was the highest ranking CSA General, and whom id never heard of, his Wiki states " One of his last official acts as Adjutant General of the U.S. Army was to sign an order dismissing Brig. Gen. David E. Twiggs from the army. Twiggs had surrendered his command and supplies in Texas to the Confederacy (and was shortly thereafter made a Confederate major general.) This order was dated March 1, 1861, and Cooper resigned six days later. He traveled to Montgomery, Alabama, at the time the Confederacy's capital, to join the Confederate States Army." which leads the question; who else did such a thing as Twiggs? there must have been others given the time?

dirtyoldmikegza

I am particularly interested in officials who "worked both sides" during this period. I'm guessing many forts throughout the south went over almost en masse? ( quick clarification, by "both sides" I mean holding a position in the USA govt at a federal level, while simultaneously working for the Csa, state government in the south I'm assuming just changed flags mostly)