How did gun powder change europe

It changed military tactics.

In several ways. It changed military tactics. First, it killed whatever was left of chivalry as anyone one using a gun could kill a knight in armor (in the mid-middle ages knights were allowed to fight each other, but not a peasant and a

Pikemen, more specifically, Swiss mercenaries using the famed halberd only shined at the end of the middle ages, at a time where guns were already in Europe.