[Tuor in Gondolin]

This is an interesting topic. You'd think that the elves, given both
the concern of Maedros to contain Morgoth and the Feanor genes in
Maedros and his brothers that some Noldor would have come up with
some sort of anti-dragon weapon (a crosbow equivalent?) or perhaps
an anti-dragon poison gas. Or, since early dragons couldn't fly, some sort
of entangling ropes, wires, etc. ,perhaps some sort of deadfall traps,
orbright, flashing lights.