orning the cavalry and our
battery advanced several miles, going in position on a hill. Thirty
cavalrymen were captured last night. Scouts coming in the afternoon
informed of the enemy's presence, only four miles from us. We fell back
until, to our surprise, we found the whole of the Second corps in line of
battle. Our battery took position immediately. The whole road was covered
by our artillery.

_Sunday, September 7._--Near Rockville. The rebel army occupies Frederick
City. Our cavalry dashed into Poolesville. We marched only six miles
to-day.

_Tuesday, September 9._--We started by ten o'clock, A. M., and marched
seven miles. Our cavalry had a fight at Barnesville.

_Wednesday, September 10._--March to Clarksburg. Our advance is getting
very slow.

_Thursday, September 11._--March to Hyattstown, eight miles from
Frederick. We formed in line of battle on a hill in front of the town. Our
skirmishers advanced, but could not find the enemy.

_Friday, September 12._--Left Hyattstown at nine o'clock A. M., marched
only five miles and went to camp. Eight thousand men, cavalry and horse
artillery, passed by this afternoon. Signal lights can be seen on Sugar
Loaf Mountain.

_Saturday, September 13._--Early in the morning, we marched through
Urbana. General McClellan passed by at ten o'clock, crossing the Monocacy
river. Triumphant entrance into Frederick City. The houses and inhabitants
of the city presented a good appearance. Flags were floating all over.
General McClellan was surrounded by all of his corps and division
commanders, on the roadside. The troops cheered while marching by. Our
cavalry and horse artillery drove the rebel rear-guard out of the city,
and are chasing them up the South Mountain Pass, the smoke of the
artillery is plainly to be seen. The engine house in Frederick City is
full of prisoners.

_Sunday, September 14._--Battle of South Mountain. General Burnside,
marching all of last night, attacked the enemy, near Berkley, early this
morning. Our corps left Frederick by eight o'clock A. M., marching towards
the mountain. Considerable time was lost by getting on the wrong road. We
arrived on the top of the first range of mountains by three o'clock P. M.,
and witnessed one of the grandest scenes ever seen during the war,--the
contest for the possession of South Mountain Pass. At five o'clock P. M.
the pass was forced on the point of the bayonet, by the troops under
General Reno, who fell during th