According to the excerpt, how did the poison gas work to kill the soldiers?

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

these acts divided the south into five military districts.

b toward the volcano.landward. the landward side of something is the side nearest to the land or facing the land, rather than the sea.

the national congress's powers over the states were specific and definite: it had the sole power to negotiate treaties, declare war, and make peace. all powers not granted to congress were reserved for state governments. congress had no power to levy taxes, for example.