two armies are now concentrated upon the main road from Fredericksburg to Richmond. The rebels appear to be massed about the Court-House, where they have twenty cannons in position to bear upon the road. Their works, however, do not seem to extend far to left of the Court-House. Yesterday their trains were moving in the direction of Guiney's Station, where they apparently have a depot of supplies. Our pickets in front of Wright's lines are about 2 miles distant from the road leading to Guiney's. A brigade of rebel cavalry has appeared here within the last two days, but has done us no damage. General Grant desires that Major Morton, of the Corps of Engineers, should be sent here to report to General Burnside. Captain Harris, of the Ordnance Corps, now serving with General Burnside, might be advantageously employed elsewhere. Burnside has no more occasion for an ordnance officer than any other corps commander.

C. A. DANA.

Honorable E. M. STANTON,

Secretary of War.

BATTLE-FIELD OF SPOTSYLVANIA,

May 16, 1864-9 a.m. (Received 2.30 a.m., 17th.)

The field return of the Army of the Potomac shows present for duty on May 13, 38,254 officers and men, while that of the Ninth Army Corps shows 17,870, making total (exclusive of cavalry) of 56,124. This does not include any of the re-enforcements that have lately arrived in the Army of the Potomac.

The Second Corps counts 12,116; Fifth Corps, 14,860; Sixth Corps, 11,278. Cavalry force, I have report only from that with Burnside, which numbers 2,149.

Returns of casualties during recent battles are in the-

Second Corps-Killed, officers 88, men 1,29; wounded, officers 387, men 6,363; missing, officers 39, men 3,647. Aggregate, 11,553.

Fifth Corps-Killed, officers 76, men 985; wounded, officers 316, men 6,110; missing, officers 91, men 3,135. Aggregate, 10, 686.

Sixth Corps-Killed, officers 103, men 1,027; wounded, officers 313, men 5,747; missing, officers 51, men 2,251. Aggregate, 9,492.

Artillery-Killed, officers 2, men 5; wounded, officers 1, men 41; missing, officers none, men 71. Aggregate, 120.

Total killed, wounded, and missing, Army of the Potomac, 31,851.

Ninth Corps-Killed, 553; wounded, 3,020; missing, 1,148. Aggregate, 5,021. Grand total, 36,872.

The servant of a South Carolina officer, who escaped to our lines yesterday, reports that he heard his master say that their losses were 40,000.

C. A. DANA.

Honorable E. M. STANTON,

Secretary of War.

SPOTSYLVANIA BATTLE-FIELD,

May 16, 1864-7 p.m. (Received 2.15 a.m., 17th.)

No movements of importance to-day, and no fighting. Burnside has been firing his cannon for the last two hours to cover the removal of some hospitals left by Hancock when he withdrew from