Visit the real thing at Historic Jamestowne, explore the actual location and active archaeological dig, Jamestown Rediscovery, home of the first successful English settlement.
Jamestown Unearthed: 3-D Printing Technology Brings Artifacts to Life
Caltrop, Military Wiki
Sold at Auction: c 1860 Civil War Period Caltrop Medium, Six Pointed Anti-Cavalry Spiked Metal
Visiting Historic Jamestowne In Virginia - No Home Just Roam
Visiting Historic Jamestowne In Virginia - No Home Just Roam
New Discoveries at Jamestown, John L. Cotter, J. Paul Hudson
WWI Trench German Caltrop Relic
Sold At Auction: 1775 Revolutionary War Era Hand-Made
How were caltrops used? - Quora