Those rocks don't roll, they fly.
This is a trebuchet- not a catapult- used for slinging boulders at castle walls. This particular replica is located at Warwick Castle where its use is demonstrated several times a day during tourist season. That's the River Avon behind. (Yes, that River Avon.)
Topaz Clarity was the plugin of choice for this photo, and it managed to bring out details that a lot of other plugins could not- at least not as easily.