Shortly after the adjournment of the last session of Congress the
gratifying intelligence was received of the signal victory of Buena
Vista, and of the fall of the city of Vera Cruz, and with it the strong
castle of San Juan de Ulloa, by which it was defended. Believing that
after these and other successes so honorable to our arms and so
disastrous to Mexico the period was propitious to afford her another
opportunity, if she thought proper to embrace it, to enter into
negotiations for peace, a commissioner was appointed to proceed to the
headquarters of our Army with full powers to enter upon negotiations and
to conclude a just and honorable treaty of peace. He was not directed to
make any new overtures of peace, but was the bearer of a dispatch from
the Secretary of State of the United States to the minister of foreign
affairs of Mexico, in reply to one received from the latter of the 22d
of February, 1847, in which the Mexican Government was informed of his
appointment and of his presence at the headquarters of our Army, and
that he was invested with full powers to conclude a definitive treaty of
peace whenever the Mexican Government might signify a desire to do so.
While I was unwilling to subject the United States to another indignant
refusal, I was yet resolved that the evils of the war should not be
protracted a day longer than might be rendered absolutely necessary by
the Mexican Government.

Care was taken to give no instructions to the commissioner which could
in any way interfere with our military operations or relax our energies
in the prosecution of the war. He possessed no authority in any manner
to control these operations. He was authorized to exhibit his
instructions to the general in command of the Army, and in the event of
a treaty being concluded and ratified on the part of Mexico he was
directed to give him notice of that fact. On the happening of such