Just a suggestion.......I think the serrations are to 'weaken' the 'spiked' blade. Once a cannon is over-run ....it could be used by the enemy against your own men. Cannons were therefore 'spiked' ....effectively blocking the touch hole...the point thrust in the touch hole and then 'levered' too and fro to fracture the 'blade' ....the long length of the 'blade' giving more leverage making it easier to break and the tip would remain jammed in the touch hole orifice.
Kind Regards David
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