My Dear Sir:—

I enclose to you a letter from Mr. Bancroft, and will add to what he has said, that the information from Mexico comes in so authentic a shape as to entitle it to entire credit. The strong probability is that a Mexican army of eight or ten thousand men are now on the western borders of Texas. Should they cross the Del Norte, as no doubt they will, our forces at present in the country will be inadequate to resist them in their march upon Texas. Orders will be issued to-day to increase our forces as far as our disposable troops will enable us to do so. The necessary despatches from your department to Major Donaldson, or (in the event that he has left the country), to the United States Consul at Galveston, will of course be prepared by Mr. Mason. I wish it were so, that while these important steps were being taken, we could have the benefit of your advice.

Before you left you requested me to inform you, if anything should occur which in my judgment would make it necessary for you to return earlier than you intended. We are in daily expectation of receiving further information from Mexico, which may, and probably will, confirm the statement given you by Mr. Bancroft. The news of the action of the convention of Texas was despatched from New Orleans to Vera Cruz by the Mexican Consul on the 15th ult., and would probably be conveyed to the city of Mexico by the 21st or 22d. Upon receiving this information, some decisive action no doubt took place.

In addition to these reasons, which make it very desirable to have the benefit of your counsel, I must confess that the developments which are taking place, as well as my daily reflections, make it, in my opinion, more and more important that we should progress without delay in the Oregon negotiation. You may consider me impatient on this subject. I do not consider that I am so, but still I have a great desire, that what is contemplated should be done as soon as it may suit your convenience. I have felt great reluctance in saying this much, because I desired not to interfere with your arrangements during the short recreation which you have taken from your arduous labors.

I am, very faithfully and truly, your friend,

James K. Polk.

P. S.—If you determine to anticipate the period of your return to Washington, you will see the propriety of leaving Bedford in a way to produce no public sensation as to the cause of your departure. That it may not be known that you leave on receiving a letter from me, I will not place my frank on this letter.

Yours, &c.,

J. K. P.

[MR. BANCROFT TO MR. BUCHANAN.]