1. Our aviators report about one division of enemy 5 miles north, Arlington Heights. Arlington Heights occupied by one White Brigade, re-enforced. The Brigade commander has ordered the 1st, 2d and 3d Regiments to retire to intrenched lines at Cambridge.

2. This Regiment will retire over Common street-Trapelo road--Belmont street-Mt. Auburn street-Brattle street-to intrenched position. The 2d Battalion will form the rear guard. The 1st and 3d Battalions will constitute the main body.

3. (a) The main body will clear Belmont Station at 5.10 P. M.

(b) The reserve of the rear guard will follow at 600 yards.

(c) The commanding officer of the rear guard will send an officer's patrol towards Waverley, and will maintain communication with the 1st and 3d Regiments.

4. The combat wagons will follow the main body.

5. Messages to head of reserve.  CORDIER,  Commanding.

Troops.--(a) Main Body. Major Sutherland. 1st Bn. 3d Bn. Attached sanitary troops. (b) Rear guard. Col. C. M. G. Co. 2d Bn.

Map.--Boston & Surroundings. (Walker Lith. & Pub. Co.)

It was a most instructive day for the Harvard Regiment, and when the Mt. Auburn Station was reached the problem was declared off, and the Regiment marched back, with flags flying and band playing, to Cambridge. A little over ten miles was covered and only one man fell out. This casualty was a case of sore feet, and the man was immediately picked up by one of the two Red Cross ambulance cars which formed a part of the Attached Sanitary personnel following the Regiment. About 600 members of the Regiment participated in the Sunday march