Hartshorn Memorial Cannon

The black thirty-pounder Parrott rifle is approximately 102 inches (2,600 mm) long, weighs 3,495 pounds (1,585 kg), and was made at West Point Foundry in New York.

[2] In 1900, the United States War Department offered Lyndeborough's Harvey Holt Post of the Grand Army of the Republic a cannon to place near its local headquarters, Citizens' Hall, with the stipulation that the gift be considered a loan.

That year, at a dinner attended by more than 200 people at Citizens' Hall, the GAR dedicated the artillery piece to the memory of John Alonzo Hartshorn.

The younger Hartshorn grew up in South Lyndeborough in a house at the corner of what today is Citizens' Hall Road and Forest Road/Route 31.

[4] Harvey Holt, the namesake for the GAR post, was the town's—and according to Lyndeborough's official town history, state's—first Civil War fatality, having perished during the First Battle of Bull Run.

[6] In the early 1980s, Route 31 was widened, as a result of which the Hartshorn Cannon saw increased damage from winter plowing and salt use on the roadways.

Therefore, in 2009, amidst some controversy, an unknown person or people moved the cannon to what the Board of Selectmen eventually termed a "temporary location" in the Lyndeborough Center Historic District, some three miles away.