He would find some officers like MacArthur, Patton and Eisenhower to command the army to drive them out at the point of a gun.
There are plenty of politically connected senior officers who might do his bidding, but the mid-level officers and most of the troops aren’t quite so mind-numbed as the troops in the Bonus Army incident.
In addition, dugout Doug ordered the charging of the Bonus Army against the direct orders of the President (which was his style). Most of the troops did not charge, many walked away refusing to do harm to the veterans, and nobody was directly killed by the troops. It was the D.C. Police who fired their weapons and who killed the several people involved. There’s a lot of mythology attached to that event.