Last century there was the big two, World War One and World War Two. If you go back further it’s more complicated, but the short answer is that Germanic states got into wars with their neighbours a lot. The Wikipedia article has categories.

https://en.m.wikipedia.org/wiki/List_of_wars_involving_Germa...

https://historyguy.com/How_Many_Wars_Were_Fought_Between_Fra...

To be fair, everyone was warring. War was normal

https://en.wikipedia.org/wiki/List_of_wars_involving_the_Uni...

It was normal and Germany/Prussia was good at it.