4. The Fifth Division. (Miles') will proceed in light marching order, by the Little River turnpike as far as Annandale, or to the point where the road leads to the left to go into the old Braddock road (so called), which runs between the Little River turnpike and the Orange and Alexandria Railroad.

5. The brigades of the several divisions will be put in march in time to reach their respective destinations by dark.

6. The reserve will be held in readiness to march at the shortest notice, and will, on and after the 17th instant, keep constantly a supply of cooked rations on hand for two days.

7. Brigadier-General Runyon, commanding the reserve, will have command of all the troops not on the march to the front, including those in the fortifications and camps. He will, to-morrow, send two regiments up the Orange and Alexandria Railroad to aid the railroad managers in rebuilding it in the shortest possible time, the commanding officers to conform tot he plans of the principal managers.

8. Brigadier-General Runyon will guard the Loudoun and Hampshire Railroad as far as the present camps of the ohio Volunteers, and the Orange and Alexandria Railroad as far as it is or may be repaired.

9. The regiment now in fort Corcoran, the Twenty-eighth New York, the Twenty-fifth New York, at Roach's; the Twenty-first New York, at Fort Runyon, and the Seventeenth new York, at Fort Runyon, and the Seventeenth New York, at Fort Ellsworth, will not be removed from their present stations except in an emergency.

II. On the morning of the 17th the troops will resume their march after daylight in time to reach Fairfax Court-House (the third Division, Sangster's) by 8 o'clock a. m.

1. Brigadier-General Tyler will direct his march so as to intercept the enemy's communication between Fairfax Court-House and Centreville, moving to the right or the left of Germantown, as he may find most practicable. On reaching the Centreville turnpike he will direct the march of his leading brigade either upon Centreville or Fairfax Court-House, as the indication of the enemy may require. The Second Brigade will move on the road in the direction not taken by the First. The rear brigades will be disposed of by the division commander a circumstances may require. Should he deem it best, a brigade may be sent on Fairfax Court-House direct from Flint Hill.

2. The Second Division (Hunter's) will (after the road shall be cleared of the Fifth Division) move on the direct road to Fairfax Court-House by the Little River turnpike.

3. The Fifth Division (Miles') will turn off from the Little River turnpike and gain the old Braddock road, which it will follow to its intersection with the road from Fairfax Court-House to Fairfax Station, where it will turn to the right and move on the Court-House.

4. The Third Division (Heintzelman's) will move by the best and shortest of the roads to the south of the railroad till he reaches the railroad at Sangster's. He will, according to the indications he may find, turn his Second and Third Brigades to the right, to go to Fairfax Station or to the front to support the First Brigade. He may find it necessary to guard the road coming up from Wolf Run Shoals and the one leading to Yates' Ford.

III. The enemy is represented to be in force at Centreville, Germantown, Fairfax Court-House, and Fairfax Station, and intermediate places, and on the road towards Wolf Run Shoals. He has been obstructing, as far as possible, the roads leading to Fairfax Court-House, and is believed on several of these to have thrown up breastworks and planed cannon. It is therefore probable the movements above ordered