When an armed force is called out for the purpose of suppressing an unlawful or riotous assembly it must obey the orders in relation thereto of the civil officer calling it out and render the aid required. The orders of the civil officer may extend to a direction of the general or specific mission to be accomplished and the duration of service by the National Guard, but the tactical direction of the troops, the kind and extent of force to be used and the particular means to be employed to accomplish the mission specified by the civil officers are left solely to the officers of the National Guard.