Historians and archaeologists have three methods to reconstruct history: through primary sources, secondary sources and the oral history. Primary sources include the artifacts, videos and letters; while secondary sources are through books and reports. Oral history, on the other hand, are not written sources. They are passed on to generations through stories, songs, and may manifest in their customs and traditions.
is because these types of weapons proved to be extremely terrible and torturous in warfare, and no country wanted their citizens exposed to such weapons
