I have a question. I agree that shanties were not used in the navies because they had so many men to do the work. However, there was one time in which they were undermanned for sailing the ship and that was when the extra men were doing the other jobs they were there for, i.e., fighting.

When the ship was engaged in action most of those extra men were busy loading and firing and the sailing was left suddenly to far fewer men. they probably wished for shanties then though adrenaline may have made up the difference.