To be fair those are likely musket/caliver shots firing through plank reinforced wattle (making it musket but not cannon-proof) however we have form for cannon armed crannogs, see this one same year at Augher.

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Just because we're a charity doesn't mean we're not allowed to have beef

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An aside to Glastonbury being the Isle of Glass in Welsh: when the base of the Tor was a lake, several villages were built in the marshes - Iron Age crannogs.
One of them, Meare Lake village, was a centre for rare Iron Age glass bead making.

A real Glass Isle.

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