Upon the fall of Vicksburg and Port Hudson two objects in the Southwest were presented to the consideration of the Government at Washington--Mobile and Texas. General Banks, commanding the Department of the Gulf, was anxious to proceed against the former; a desire fully shared by the navy, which knew that sooner or later it must be called upon to attack that seaport, and that each day of delay made its defences stronger. Considerations of general policy, connected with the action of France in Mexico and the apparent unfriendly attitude of the Emperor Napoleon III. toward the United States, decided otherwise. On the 10th of June, 1863, just a month before the fall of the strongholds of the Mississippi, the French army entered the city of Mexico. On the 24th of July General Banks was instructed to make immediate preparations for an expedition to Texas. This was speedily followed by other urgent orders to occupy some point or points of Texan territory, doubtless as an indication that the course of interference begun in the weaker republic would not be permitted to extend to lands over which the United States claimed authority, though actually in revolt. The expectation that France would thus attempt to interfere was far from lacking foundation, and was shared, with apprehension, by the Confederate Government. A year before, M. Theron, a French consul in Texas, acting in his official capacity, had addressed a letter to the Governor of the State, suggesting that the re-establishment of the old republic of Texas, in other words, the secession of the State from the Confederacy, might be well for his "beloved adopted country;" and ended by saying that the Governor's answer would be a guide to him in his political correspondence with the government he represented. In consequence of this letter, M. Theron and the French consul at Richmond, who had also been meddling with Texan affairs, were ordered to leave the Confederate States. The object evidently was to set up an independent republic between the new empire in Mexico and whichever power, Union or Confederacy, should triumph in the Civil War.