On April 25, 1846, Mexican cavalry attacked a group of U.S. soldiers in the disputed zone under the command of General Zachary Taylor, killing about a dozen. They then laid siege to an American fort along the Rio Grande
The slaves on board were suffering from some illness.
Explanation:
The narrator is afraid of ravage from the flux that i s the diarrheal infection.On june 27 the sick slave jumped.Since the narrator was afraid on June 22 of the ravage of the flux it gives us the hint that the slaves on board were suffering from some illness whether it is less or more.