A letler reoeiveu in Washington irorn Admirnl Potter, pronounees Banks' recer.t expedititiii a most disaslrous : iire. Bisides over thirty pitees oí ! tillery, a largo quantity oí' snmll anus, several hundri'd wngoos and a íirst olass gunboat - úie Eastpnrl - nearly four thonsand piisoners have been lost; and, i) addilion. the payinaster's safe, coutuining a inillion dollars in greenbauks, was captured by theenerny. A coirespondunt frritiog irom Washington, save: Tho government w in possession ol news showing that Bauks' disaster is vaetly greater than arnwod, and bis incapacity more unmil tary than has ever been supposed. There is within tlie cabinet, as well as without U, a strong ctll upou the President to remove or supeisede him. The object of the expeduion in which this mist'ortune oeurred. muuh su-pectcd, uill be iuquired into. Anothor correspondent, wiiting irom Grand Ecore, La., under date of April 16tli, ays : The official list of il:o entire losfes in the lóth Corps rn.-ike au aggregate of one thousand sevon hundred and eleven wounded. The missing will not swell Ibe aggregate more than six hnudred - (ien Lee's cuvalry división lost six huiidrod in all. With tho idterations the entire Itisses ia this department, since tho oainpiiign opened, amount to thre.o thousand four hundred. Onr enliri) loss in killed will not exceed 300, probably. Major General Peck is reliuved from the command of the forces in North Carolina aud is succeedtd by Brie. Gen. 3 N Palmer.