The Magnus effect was used on bombs since WWII. If they spun the bomb properly, it would skip across the water and hit targets floating on that water. Or, it could be "scheduled" to submerge at a given point. (Based on the spin speed and altitude at release)
It's a horrible use of cool physics, but apparently it was quite effective.
Oh wow, that is insane. But super cool, yes. Thank you so much for the share!