This Cyrus Alger & Co. M1838 6-pounder field gun is currently located on the lawn of the Gasconade County Courthouse, in the city of Hermann, Missouri.
Forgive the odd syntax of this article; I copied it from a website about Hermann, MO, and it was written by a reporter for The Advertiser-Courier on the 9th of October, 1907.
"On the afternoon of October 4th, 1864, the advance of Gen. Marmaduke's army in their march westward made its appearance on the hills on the east side of town. The town which maintained a militia company composed of infantry and also a section of artillery had received before the war from Gov. Stewart a cannon, and this on the arrival of Gen. Marmaduke's army a handful of desperate citizens picked up and from the railroad track at the high school fired at the intruders who were coming around what is now called Frank's Bluff. Our gunners in a jiffy pulled their cannon on the hill where the Catholic church stands and fired at the Confederates on the opposite hill, from here they went into the wineyards of the new Stone Hill Wine Co., and kept up the shooting till their ammunition gave out. The Confederates figured that all of the western hills in town were fortified with artillery and checked their advance for an hour or more. The gun had in the meantime been spiked and thrown in the river.... The cannon was later fished out of the river by some soldiers and taken to Jefferson City, but again restored to the town by Gov. Gamble.
For the celebration commemorating the 50th anniversary of Hermann's founding, the cannon was to be fired 50 times. However, on the 48th firing, the barrel burst irreparably."
It's a shame that the townspeople celebrating Hermann's 50th anniversary didn't do a little more research on bronze cannons, because if they had, they might have learned that quickly firing a number of successive shots in a bronze gun could cause it to overheat; even to the extent that the barrel might be "irreparably" damaged.