With a thunderous explosion, the cannon belched fire and white smoke across the meadow.
The four men manning the weapon were dressed in Union blue, with red piping on their navy uniforms. In front of them, other men marched in formation carrying a U.S. flag with just 34 stars on it.
They were armed with Springfield rifled muskets, sabers and knives. Some sported beards and mustaches with an 1860s look.