What was the last battle/war that used traditional medieval equipment in Europe? Not sure what defines the end of the "Medieval Era" or the Middle Ages, unless its the renaissance.
A few months ago, I asked a tangentially related question. This isn't in Europe as such, but it may be of interest to you.
It turns out that conquistadores used a number of "medieval" weapons in their war against the Aztecs due to a shortage of gunpowder.
See /u/400-rabbits answer here