Headquarters Army of Occupation,

 Agua Nueva, March l, l847.
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Headquarters Army of Occupation, Agua Nueva, March l, l847.

 SIR: I have the honor to report that the troops of my command occupied their orig inal camp at this place on the 27th of Feb ruary, the last of the Mexican army leaving the morning of that day in the direction of l San Luis. IL is ascer,ained that the enemy l is in full retreat, and in very disorganizei condition-the men deserting, and dying of starvation in great numbers. l dispatch command this day as far as Eucarnati0n 10 harass .hisTear, and secure whatever mili- tarysupplies may be found there.

 From the statement of Mexican officers, particularly Of the medical staff Jeff 10 sue. cor the wounded, there seems ID douEt that Ftheir loss fn the recent action isAnaodfgase-l ly estimated at, l,5OO and may reach POGO men, killed and wounded. beside 2,0OO Or 5000 deserters. Many officers of rank were lost. I enclose list of the names of our own killed and wounded, made as mplets' as practicable at this time. One regiment (Kentucky cavalry) is. not included, it's re- turns not being rendered.

 The enemy had fully reckoned upon our total rout, and had made arrangements to intercept our retreat and cut off the army, stationing for that purpose corps of cavalry, not only immediately in our rear, but even below Monterey. regret to say that they succeeded near the village of Marin, in de- stroying train of supplies, and killing considerable number of the escort and team. sters. Col. Morgan, 2d Ohio regiment on march from Cerralvo to Monterey, was in- fested by the Mexican cavalry, with which he had several rencounters, but finally dis pefsed them with small loss on his own part. Capt Graham, A. O M. volunteer service vas mortally wounded in one of these af- fairs. have no doubt that the defeat of :he main army at Buena Vista will secure our line of communications from farther interruption, but still propose in few days to change my headquarters to Monte rey, with view to make such arrange ments as may be necessary in that quarter.

 The dispositions made 10 harrass our rear, vindieate the policy and necessity Of defending a position in front of Saltillo. where a defeat has thrown the enemy far back into the interior. No result so deci. sive could have been obtained by holding Monterey, and our communications would have been constantly in jeopardy.

 l am, sir, very respectfully, your obedient servant.

 z. TAYLOR,

 Major General, U. s commanding.

 The Adjutant General cf the Army,

 Washington, D. C.