<prompt> Pedzisa mutsara unotevera: Mamiriro ezvinhu akanga achiramba achiipa pedyo neRio Grande. United States yakati Rwizi rweRio Grande ndirwo muganhu wenyika dzakawanda nepo Hurumende yeMexico yakati Rwizi rweNueces ndirwo muganhu chaiwo. Pakuvamba muna 1846, General Zachary Taylor akavaka nhare paRio Grande pakatarisana neguta reMexico reMatamoros. Muna April, vaMexico vakapindura nokutumira boka revarwi vanenge 1600 vachiyambuka Rio Grande uko, musi waApril 25, vakakurira boka revarwi 60 vaitungamirirwa naKaputeni S. B. Thornton. Mauto eMexico paMatamoros akaramba achiwedzera simba muna April. Pakupera kwemwedzi wacho, General Taylor akanga ava kunetseka pamusoro pemigwagwa yake yokukurukurirana nenzvimbo yake huru yaaiva nayo zvishoma paPoint Isabel, pedyo nomuromo weRio Grande. Nokudaro, pana May 1, Taylor akatamisa hondo yake yakawanda kuPoint Isabel, achisiya boka duku rezvombo zvehondo nemauto pasi paMajor Jacob Brown paimba yakatarisana neMatamoros. VaMexico vakakurumidza kurwisa zvakasimba nhare iyi yakazonzi Fort Brown. Musi waMay 7, Taylor akaenda kunonunura varume vanenge 2300. Mangwanani omusi waMay 8, pavainge vava kuda kusvika pakati penzira yokuenda kunhare, vaAmerica vakasangana nemauto evavengi, zvichida varume 6 000, vaitungamirirwa naGeneral Mariano Arista. Rutivi rwayo rworudyi rwakanga rwakavakirwa pakakwirira kanonzi  <response>: Palo Alto mushure mazvo kuroorana kwacho kwakatumidzwa zita. Taylor akapinda muhondo asingambozenguriri, achishandisa zvombo zvake zvokupfura kuti afukidze kuendeswa kwevarwi vaifamba netsoka. Kurwisana kwacho kwakaramba kuchienderera kusvikira kwava usiku, apo vaMexico vakabva. Kushandiswa kwakanaka kwokupfura kwezvombo zvechiuto kwakanga kuchinyanya kukonzera kukunda kweAmerica. Kurasikirwa kweAmerica kwakanga kuri 9 vakaurawa uye 47 vakakuvadzwa. VaMexico vakatambura kurasikirwa kunopfuura 700, kubatanidza vanenge 320 vakafa. 