3.—On the thirty-first of May, 1931, you are Major General Perkins in command of the 16th Division, 22d Corps. War has just broken out and not any of your army has crossed the frontier as yet. However, it is going to do so on the next day, and the 22d Corps is going to march on Thurmont and Frederick. Your division has been ordered to cover the left of the whole army. Your independent cavalry in command of Colonel Frank and composed of the 11th Cavalry and the first radio section of the Signal Corps, is to be followed by the Advance Guard under command of Brigadier General Blood. The advance guard is composed of the first Brigade, the first battalion of the first field artillery, a company of the first Battalion of Engineers, the first Ambulance Company, and one radio section of the Signal Company. You sign your order at eight in the evening and send copies to Brigadier Generals Blood, Cook, Dean, Enfield, Colonel Frank, Major Good, Captain Harry, by officers. You also furnish copies to your staff. You decide to have your division march on Gettysburg in order to carry out your mission. Your main body is going to start at seven in the morning and will march in the following order: one section of the Signal Company, the first battalion of the 4th Infantry, all but one battalion of the first brigade of Field Artillery, all of the second Brigade but the first battalion of the 4th Infantry, the entire third Brigade, all but one company of the first battalion of engineers, Signal Company A without certain detachments mentioned before, the field artillery combat trains, and three ambulance companies. You want the advance guard to be up and out of camp at half past six in the morning. It is to march by the Chambersburg Pike on Gettysburg and to be followed by the main body with a mile between the two units. The independent cavalry is to be up and out of camp by six o’clock in the morning. You want your trains to follow your main body five miles behind it and you want them to follow in this order: field trains, first section of the supply trains, ammunition column, the remainder of the supply trains, field hospitals, medical reserve, pack train. You want your independent cavalry to advance on Gettysburg. You want your independent cavalry to reconnoiter all the roads which run out of Gettysburg to the south and east and you want them to get in touch with the cavalry of the corps as soon as possible. You are going to march at the forward end of the reserve of the advance guard. When you have signed your order at Chambersburg where your troops are located, you have it telegraphed to Corps headquarters.