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OFFICIAL.

Head Qsarssrs.l lArmyeofO Oecnpation

 .A.. Camp on the field of battle, Rtiena Vista. Mexico. Feb. 4. l847.
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0ucuo iSsa, iuCAs ssskps GSO. 1s AO1s 2 Jrs t r:-l have the honor 70 report, that having become assured on the enemy had assem sled heavy force at Encarna. cion thirty miles in front of Agua Nueva, with the evident. design of attacking my position. broke up my camp at the lat. ter place on the 2l>t, and took up a strong line in front of Buena Vista, seven miles soulh, of iSaltillos A cavalry force left at Agua Nueya for the purpose of cover ing the removal of supplies was driven in during the night, and on the morning of the 22d the Mexican army appeared immediately in iron, of our position A, II o'clock A. Nj. a flag was sent beariog from Gen. Santa Anna summons of un- conditional surrender, to which imme- dialely returned negative reply us hele. with enclOsrd.

 The nc ton was commenced late in the afternoon b.tween the light troops on the left flank, but was not seriously engaged un,,l the morning of the 23d, when the enemy made an cf,,rt to force the left flank ut our positiou. An obstinate and s;lns uinary conflict was maintained with short intervals. throu -hout he day, the result being that the enemy was complete lv rcpuised from our lines. An attack of cavalry upon the rancho of Bucna Vesta and demonstration upon the city of Sal ,,lio were likewisa handsomely repelled. Early in the night the enemy withdrew from his camp and fell back To Agu2 Nu- eva. distance of l2 miles.

 Our own force engaged at all points in this action fell somewhat short of 5 400 men, while that of tAc Cnemy, from t!.e sta.ement af Gen. Santa Anna, may be estimated Il, 10000. Our success against such great odds is !, sufficient encomi> u,n on the good conduc, of our troops.- Ia more detailed official report shall have the satisfaction of bringing to the nn,ice of the government the conspicuous ulan.sy af particular officers and corps 2 I dViay be permitted, here, however to ac- knowledge my great oblig .tons 10 Brig. Gen. Wo ,l, the secMid in command, to whum feel pnrtie ularly indebted for his valuable serviccs on this occasion.

 Our loss has heen severe. and will not probably fall short of 700 men.

 The Mexican loss has hecn immense. 1 shall take the earliest opportunity oftor- warding a correct list of the casualties of thu d.y.

 am sir, very respectfully.

 Your obcdient servant

 E. TAYLOR.

 Major Gen. U. S, A. commanding. The Adi iutnrt General of the Army, Wash inglon, D. c.