@sterven Crecy was actually the first time that a cannon was used into battle.
And if you want since it is quite a spoiler, there are also accounts provided by the first poor SoDs who ended up to be the first troops in history to experience artillery shelling
@Redcloack
I have read about the Battle of Crecy but I must have skimped over the cannon part. My main take away from that battle was how it established the effectiveness
of the longbow in warfare.
@Robbini Cannons have always had that general long tubular shape. Most of the technological advancements in that field have been improvements on firing mechanisms, how the cannon is mounted and transported, ammunition, and the overall metallurgy. It wouldn't be until percussion caps and advancements in breech-loading that gunpowder artillery would make the leap to modern artillery styles.
At this point in time that "bell" is excess iron used to compensate for inferior metallurgy so it doesn't just explode upon ignition.
@Robbini Bombard is a subtype of cannon, generally used explicitly for siege warfare against fortifications. Mostly defined by having a non-wheeled mounting and short, large caliber barrel.
https://en.wikipedia.org/wiki/Bombard_%28weapon%29
@BanditHadron I typically consider rifling a sub-group of metallurgy / ammunition.