Deni Seymour has spent decades researching first contact between Native Americans and European settlers. Then she found a 500-year-old cannon.

In Arizona, researchers have unearthed a bronze cannon, or "wall gun," linked to ... which included areas of modern-day Arizona, New Mexico, Texas, Kansas, and Oklahoma. The purpose of the ...

It was a hot fall day, the sun beating down as they worked. Eventually, there it was: a 3.5-foot long, cast bronze cannon. Seymour looked at in awe ... Most were made from bronze, a valuable and ...