From Shelby Foote’s The Civil War: Fort Sumter to Perryville (287-288):
[At the Battle of Pea Ridge,] they saw the rebels coming, yelling and firing as they came, hundreds of them bearing down to complete the wreckage their artillery had begun. As the Federals fell back from their shattered pieces an Iowa cannoneer paused to toss a smoldering quilt across a caisson, then ran hard to catch up with his friends. Still running, he heard a tremendous explosion and looked back in time to see a column of fire and smoke standing tall above the place where he had fuzed the vanished caisson. Stark against the twilight sky, it silhouetted the lazy-seeming rise and fall of blown-off arms and legs and heads and mangled trunks of men who just now had been whooping victoriously around the captured battery position.