"The enemy were charging at “a right shoulder shift,” and did not fire at all. Many a blue coated Federal was left on the field, and a good number came into our lines, surrendering."

Jesus, Mary, and Joseph! With double canister at 20 yards, and then single canister, firing into a column I would think that "Many a blue coated Federal was left on the field..."

Here is a night fire from Fresno CA a few years ago. We fired by file from the right. Obviously in conjunction with a fireworks display.