Revolutionary War era Hand Wrought Iron Spike Dug Near the Yorktown Battlefield

Revolutionary War era (late 18th c.) Hand Wrought Iron Spike Dug Near the Yorktown Battlefield.  Dug many years ago on the coastline  and the near location of several shipwrecks from the Battle of Yorktown and.  Have 2 examples, 5 in. and 5.5 in. respectively.  Picture is an example.