A confidential dispatch from General Scott to General Taylor was opened, read, and freely discussed at headquarters at Monterey. A duplicate was sent forward, but the party in charge of it was killed at Villa Gran and the dispatch delivered to General Santa Anna. Taylor had made a movement toward Tampico, and hence did not receive the first dispatch delivered at Tampico. In the later dispatch General Scott had written him that he might have his choice of two armies--either remain as the commander of Northern Mexico, or accompany General Scott in command of a division toward the City of Mexico, with every assurance in either case of confidence and support. General Scott anticipated the difficulty of timely concentration of forces off the Brazos large enough to give hope of success. He thought it necessary to have fifteen thousand troops, of which five thousand were to be regulars, and to have the co-operation of the navy. The time named for the concentration was the middle of January, so that the army might reach Vera Cruz by February 1st. He had requested the advice of General Taylor on these matters and all others in regard to the proposed campaign. He had intimated, in a letter of November 15th, that it would be necessary to withdraw a large number of troops from General Taylor, and thus reduce him to the defensive, while he thought it absolutely necessary for success that General Taylor should have a force sufficient to act offensively in the direction of San Luis Potosi. In addition to the volunteers and regulars at Tampico and those moving there, he desired that Worth's division of regulars, Duncan and Taylor's field batteries, a thousand mounted men, and all the volunteer infantry that could be spared be sent to General Taylor, only retaining a force sufficient to hold Monterey and protect his communications to Point Isabel. From New Orleans General Scott had written the Secretary of War that he approved of the rendezvous at Pensacola rather than at Brazos for the ordnance and ordnance stores. He also urged that volunteers be forwarded rapidly to Brazos. Subsequently he wrote the Secretary of War asking that ships with troops and supplies be ordered to Lobos Island. He addressed a letter to General George M. Brooke, commanding at New Orleans, giving detailed orders of what he required of him. He also wrote to Commodore Conner, and made suggestions about joint operations.