Cannons abandoned by doomed Spanish expedition are thought to be oldest firearms found in US

Archaeologists working in Arizona have discovered what appear to be the oldest firearms ever found in the continental United States: two cannons abandoned by a Spanish expeditionary force that was attacked by Native Americans.

​ Archaeologists working in Arizona have discovered what appear to be the oldest firearms ever found in the continental United States: two cannons abandoned by a Spanish expeditionary force that was attacked by Native Americans. Read More Breaking News, Latest News and Videos | CNN