20 ILCS 1805/84

Whenever any military force is so ordered out by the Commander-in-Chief, the commanding officer thereof may arrest any person or persons in view without process and hold them in custody until, by order of the Commander-in-Chief, such person or persons are discharged from custody or delivered over to the civil authorities. Such commanding officer may also use such force as he may deem necessary to suppress riots, disperse mobs, restore peace and execute the law.