8 July 2025 The Future is the Product of the Past

Oldest US firearm unearthed in Arizona, a 500-year-old bronze cannon linked to Coronado expedition

Independent researchers in Arizona have unearthed a bronze cannon linked to the 16th-century expedition of Francisco Vázquez de Coronado, and it is marked to be the oldest known firearm found in the continental United States.

The 42-inch-long, roughly 40-pound sand-cast bronze cannon was discovered at the location of a Spanish stone-and-adobe structure in the Santa Cruz Valley that is thought to have been a part of the short-lived settlement San Geronimo III.

To finance an expedition to North America in 1539, Vázquez de Coronado took out large loans and mortgaged his wife’s possessions. The Spanish conquistador and his 350 soldiers intended to locate the legendary (and nonexistent) Seven Cities of Gold north of Mexico. By 1541, they had reached southern Arizona, where they established a settlement they called San Geronimo III, or Suya. San Geronimo was the first European town in the American Southwest.

 Rather than accumulating immense wealth, Coronado and his men plied, and spent the next three years plundering, enslaving, and murdering their way across the region. These transgressions did not go unanswered. In the predawn hours of one fateful morning in 1541, the native Sobaipuri launched a surprise attack on the town. Many settlers were killed in their beds, and the survivors fled in disarray. The cannon — meant to intimidate and protect — was never even loaded.

Although Coronado was bankrupt and facing war crime charges when his expedition came to an end in Mexico City, his impact on North America would last for many generations.

The wall gun was resting on the floor of a Spanish structure. Credit: International Journal of Historical Archeology

One site in particular has produced a large number of artifacts associated with the explorers, according to the authors of a study published on November 21st in the International Journal of Historical Archeology. Researchers found European pottery, weapon parts, including a 42-inch-long bronze cannon, and glass and olive jar fragments in the ruins of a stone and adobe building in Arizona’s Santa Cruz Valley.

“Not only is it the first gun ever recovered from the Coronado expedition, but consultation with experts throughout the continent and in Europe reveal that it is also the oldest firearm ever found inside the continental USA,” Archaeologist Deni Seymour explained.

The early firearm also called a wall gun, was typically used as a defensive weapon positioned on a wooden tripod on fortification walls and required two operators. However, in Coronado’s case, such a cannon would have been used offensively, typically to pierce the weaker walls of buildings in Indigenous communities.

Archaeologists were able to date the cannon to Coronado’s time using radiocarbon dating and optically stimulated luminescence techniques, and the other artifacts matched descriptions of the supplies and possessions of his expedition. However, the wall gun’s simple casting suggests that, in contrast to more elaborate Spanish cannons, it might have been built in Mexico or the Caribbean—and possibly even acquired from Ponce de León’s previous expedition.

Seymour, D., Mapoles, W.P. Coronado’s Cannon: A 1539-42 Coronado Expedition Cannon Discovered in Arizona. Int J Histor Archaeol (2024). https://doi.org/10.1007/s10761-024-00761-7

Cover Image Credit: A bronze medieval-style wall or rampart gun, believed to have been part of the Francisco Vázquez de Coronado expedition found in southern Arizona. Credit: Deni J. Seymour

Related Articles

Ancient Mesopotamians bred horse-like hybrids

17 January 2022

17 January 2022

New research finds that Mesopotamians were utilizing hybrids of domesticated donkeys and wild asses to drive their war wagons 4,300...

A 3300-Year-Old Canaanite Shipwreck Ever Discovered with All Its Cargo off Israel’s Coast

21 June 2024

21 June 2024

An Energean natural gas surveying vessel operating about 90 kilometers (56 miles) off the coast of Israel discovered a ship...

Stone-arched tunnel discovered near Achaemenid dam in southern Iran

4 February 2022

4 February 2022

A cultural heritage protection team has recently discovered a stone-arched tunnel located near an Achaemenid embankment dam in southern Iran....

Archaeologists Find Mysterious 2,800-year-old Channels in Jerusalem

30 August 2023

30 August 2023

Archaeologists excavating in Jerusalem have uncovered a network of mysterious channels dating back to the days of King Joash and...

Young Metal Detectorist Discovers Huge Viking Treasure Hoard in Denmark

23 April 2023

23 April 2023

A group of hobby metal detectorists has discovered two Viking treasures buried a few meters apart near the ruins of...

Complex Of Early Neolithic Monuments Discovered In Herefordshire, England

22 July 2023

22 July 2023

Archaeologists discovered a remarkable complex of early Neolithic monuments while investigating the area around Dorstone Hill in Herefordshire, England. The...

The very unknown ancient city of the Mediterranean; Syedra

3 July 2022

3 July 2022

Known as Turkey’s holiday paradise, the Antalya region is a treasure when it comes to ancient cities. Close to the...

460-Year-Old Wooden Hunting Bow Found in Alaska’s Lake Clark

11 March 2022

11 March 2022

In late September 2021, National Park Service employees made an unlikely discovery in Lake Clark National Park and Preserve in...

A 1,700-year-old trident discovered in Assos ancient city in Türkiye

10 October 2023

10 October 2023

An iron trident, believed to be used for fishing, dating to the 3rd or 4th century A.D. has been discovered...

Early Imperial cemetery in Nîmes, in the south of France

4 October 2022

4 October 2022

Inrap archaeologists excavating at Nîmes in southern France have uncovered a cemetery dating to the first to second centuries AD...

From Bronze Age to Buddhism: Xinjiang’s Archaeological Journey Through Time and Recent Discoveries

4 March 2025

4 March 2025

Recent archaeological investigations in the Xinjiang Uygur Autonomous Region have significantly enhanced our understanding of the area’s historical context and...

Bronze Age family systems deciphered: Paleogeneticists analyze 3,800-year-old extended family

31 August 2023

31 August 2023

A Bronze Age family living 3,800 years ago in the Southern Urals may have taken a flexible approach to marriage,...

Archaeologists unearth human spines threaded onto reed posts in Peru

5 February 2022

5 February 2022

Archaeologists have found almost 192 examples of human vertebrae threaded onto reed posts 500 years ago in the Chincha Valley...

Rare Sassanid-era Inscription on Loyalty and Justice Unearthed in Marvdasht, Southern Iran

11 June 2025

11 June 2025

A rare Sassanid-era inscription has been unearthed in the historic region of Marvdasht, located in Iran’s Fars province, revealing deep...

Archaeologists may have uncovered a 13th-century castle in Shropshire

7 August 2021

7 August 2021

Archaeologists have been working on a mound of land in Wem, Shropshire, that belongs to Soulton Hall, Elizabethan mansion and...