Almost overnight, this Scottish field is turned into a medieval construction site. Timber framers, stonemasons, carpenters and blacksmiths turn back time and employ medieval building techniques to construct two giant trebuchets. One design features a fixed counterweight and wheels; the other is wheel-less and is loaded with a swinging counterweight.

Observes Marcus Brandt, an on-site carpenter: "If it weren't for the jets flying overhead, you'd think you were in the 12th century."

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