From the Washington Union. OFFICIAL DISPATCHES,
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,Despafches from Gen. Taylor The great loss of the .Mericaa .fralg-Loss Of tlse .1msricans-Ltst of our kiffed and round ea-.}gHd .S'aera agaiH OoeRPied by osfs

 troops Rsfreat, starrafioHl. deSsrtion and

 dlsorgaaizafioH of SaHta .1aaa's army.

 We have never published number of the Union. that was fraaght with more interest .ing papers than the present. Independently 7oi tile important letter cf the President. and the admirable report of the Secretary o( the Irreasury, in reply upon the duties to be le- |vied on imports into the ports of Mexico, we lay before our readers the very interesting from General Taylor, and let .ier from Commodore Conner, concerning the landing of our troops al Vera Cruz The two sets of despatches were brought by ihe southern steamboat this evening The des- patches from Gen. Taylor were brought to the Secretary of War by MT. Cnuenden, a .volunieer aid of Gen. Taylor. The commo- ldore's letter came 10 the Secretary of the Ma Ivy through the mai from New Orleans. FROM GEN. rAYLoR'S CAMP

 

 Headquarters Army ei Occupation, Camp oa the field oT Baltic, Baeha Vista,

 Mexico, February sa. IsaT. SsR-I have the honor to report that hav- ing become assured on the 20th inst, tha. the enemy had assembled inrery heavy for ces at Encarnaiiou. thirty miles in front of Agaa Nuera, with the evident design of at- taeking nay position. broke up my camp in the latter place oa the Fist, and took up a strong line in front of Buena Vista. seven niles south of Saitillo 4 cavalry force left al Agua Nueva. for the purpose Of covering ihe removal of supplies. was driven in dur ing the night, and en the morning of the 22d the Mexican army appeared immediately in front of our position. Al l. a- m-. flag was sent, bearing from Gen. Santa Anna summons of unconditional surrender To which l immediately returned negative reply. The summons and my reply arc herewith en- closed. The action was commenced late iu the afternoon between the light troops on the ss[i flank, but was not seriously engaged un- nj the morning of the e3d, when the enemy made an effori to force the Jeff flank of our position An obstinate and sangIsnsry con- fici was maintained. with short intervals, throughout the day, the result being thas the eRemy was completely repuiscd honi our lines An attack of cavalry upon the rancho of Bncna Vista and demonstration up on the eity ol SalnIio itself were likewise hand someiy repelIed Early in the night the eh- l einy withdrew from his camp and fell back upon Agaa Nuega. distance ofrweive miles

 Our own force engaged al all points in this action feil somewhat short o& 5,4G0 meal wkile that of he enemy, frsn the statement of Gen. Santa aaua, may be estimated al 20, tno Our success agains; such great odds IS "a safiacEent chromium ca lhe good conduct of our tEoeps. fn more deiaiied ofirial re- port. shall have the satisfaction of bnsging to ths ncasce of the government the eonspie- uoas gailaniry of pal aiiisuiar officers aad corps. | may be permitted here, however. to sc- knowledge my great obligations to Brig. Gen Wool. the second in command, to whom [ feel particularly indebted for h,s valuable servfees on this occasion.

 Oar loss has been very severe. and win