more, McNeil, and
others, and this had considerably depleted my line-of-battle
strength, necessitating as it did large, escorts for my
supply-trains. The most redoubtable of these leaders was Mosby, whose
force was made up from the country around Upperville, east of the Blue
Ridge, to which section he always fled for a hiding-place when he
scented danger. I had not directed any special operations against
these partisans while the campaign was active, but as Mosby's men had
lately killed, within my lines, my chief quartermaster, Colonel Tolles,
and Medical Inspector Ohlenchlager, I concluded to devote particular
attention to these "irregulars" during the lull that now occurred; so
on the 28th of November, I directed General Merritt to march to the
Loudoun Valley and operate against Mosby, taking care to clear the
country of forage and subsistence, so as to prevent the guerrillas from
being harbored there in the future their destruction or capture being
well-nigh impossible, on account of their intimate knowledge of the
mountain region. Merritt carried out his instructions with his usual
sagacity and thoroughness, sweeping widely over each side of his
general line of march with flankers, who burned the grain and brought
in large herds of cattle, hogs and sheep, which were issued to the
troops.

While Merritt was engaged in this service the Baltimore and Ohio
railroad once more received the attention of the enemy; Rosser, with
two brigades of cavalry, crossing the Great North Mountain, capturing
the post of New Creek, with about five hundred prisoners and seven
guns, destroying all the supplies of the garrison, and breaking up
the railroad track. This slight success of the Confederates in West
Virginia, and the intelligence that they were contemplating further
raids in that section, led me to send, Crook there with one division,
his other troops going to City Point; and, I hoped that all the
threatened places would thus be sufficiently protected, but
negligence at Beverly resulted in the capture of that station by
Rosser on the 11th of January.

In the meanwhile, Early established himself with Wharton's division
at Staunton in winter quarters, posting his cavalry in that
neighborhood also, except a detachment at New Market, and another
small one at the signal-station on Three Top Mountain. The winter was
a most severe one, snow falling frequently to the depth of several
inches, and the mercury often sinking below z