Cannonball Fragment Update

I was finally able to get a positive ID on the large iron piece found at the Battle of Bentonville a few days ago.  We suspected that it might be a cannonball fragment, but there was one thing that concerned me about it.  The fragment I found is obviously rounded on the outside, but the inside doesn't have the same curvature.  This is unlike most cannonball fragments I have seen in the past, which have a uniform thickness and equal curvature on the inside and out as seen in the cannonball example below.  The center would be filled with gunpowder, and a timing fuse placed in the hole would cause the cannonball to explode, sending several large pieces into the massed enemy soldiers.

In late 1862, Confederate Capt. John W. Mallet designed a new type of "internally segmented" exploding round ball which used a polygonal cavity inside the ball instead of a spherical one.  When the fuse ignited the gunpowder, the shell would fragment at the weak points in the shell wall producing a larger number of smaller fragments, which was meant to increase the damage to enemy troops.  The resulting fragments are rounded on the outside, but flat on the inside.  Each fragment will have a uniform shape determined by the geometry of the polygonal cavity, the most common being a pentagon shaped fragment.  This is the fragment I found, and a cross-section of a complete polygonal cavity shell is shown below.

The polygonal cavity cannonball was used exclusively by the Confederacy, and is fitting with the location it was found - alongside a line of fired confederate bullets at the site of a Union advance.  This type of shell was used only later in the war, and was the most commonly used Confederate cannonball in the 1865 Carolinas campaign.  Recall that the battle of Bentonville took place in March of 1865.  The complete ball measured 4.62 inches in diameter, and would have been fired from a smoothbore Napoleon 12 Pounder cannon, shown below.

With all of that history in technical terms above, it's sometimes necessary to step back from the academics and think about a recovered artifact in more personal, human terms.  It's hard to image the devastation that such a large exploding fragment could cause to the human body.  It's hard to imagine the fear of stepping out from the woodline and walking across that field, shoulder to shoulder, with rifles firing at you and shells exploding overhead.  It's hard to imagine the courage, on both sides of the battle, of risking and often losing life and limb to defend what you believe is right.  It is hard to imagine that this piece of iron which I hold in my hand was fired with the intention of taking another human life, and it is entirely possible that it was successful in doing so.  It is truly a humbling experience.

Special thanks to TheCannonballGuy over at TreasureNet for help in researching this article.