To W. H. Crawford.

DEAR SIR,—I have just received from Mr. Monroe a very extraordinary communication, confidentially made to him by Col. Jesup. A copy of it is enclosed. An invasion by a Spanish force at the present period might be pronounced a mere chimera, if a less degree of folly reigned at Madrid; unless, indeed, the Councils of Spain should be supported by a power whose councils may reasonably be more confided in. It is probable, however, that Onis is intriguing at New Orleans, and the extent to which he may mislead an ignorant, proud, and vindictive government, cannot be calculated. It is incumbent on us, therefore, to have an eye to our Southwestern frontier, proportioning our precautions to our means, and to a fair estimate of danger. As General Jackson is apprized of the apprehensions of Col. Jesup, tho’ without some of the grounds of them mentioned to Mr. Monroe, we may expect soon to hear from him on the subject. Are there any reinforcements or defences which can be added to those now within his employment? Should Jesup execute his purpose, it will be the boldest project ever assumed by no higher authority. I communicate the intelligence he gives to the Secretary of the Navy. Be so good as to do the same to your colleagues at Washington.