What English weapon destroyed the French at Agincourt in 1415?

TCDC, It was a bow, as in a bow and arrow except the bow was much longer than the normal sized bow, hence the name long bow. It's self explanatory really

The true longbow must be made of yew.

At this time in history all boys aged 7 were made to learn to use the longbow, which was first used by the Welsh.

I was thinking 'the bigger the better', that a cannon (bombard) would win over infantry