Knights, longbows and crossbows shared the battlefield up until the 15th and 16th centuries, when the concept of heavy cavalry (knights) was defeated by a mixture of infantry-centric armies with polearms and gunpowder weaponry, which didn't care about armor. Until then, bows proved to be a bane of heavy knights all throughout the medieval era.

[quote=AlidaMaria]
But well, since this is a fantasy world I suppose we could just combine stuff and go with what suits us best?
[/quote]
We could, although my inner conscious wants it to make sense in a technological context.