Zachary Taylor was a military leader in the United States (US) who served as the 12th President of the United States from 1849 until his death in 1850, option a is the correct answer.
Mexican cavalry attacked a party of US soldiers under the command of General Zachary Taylor in the disputed zone on April 25, 1846, killing around a dozen.
They then surrounded an American fort on the Rio Grande and lay siege to it.
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