Apologies if this has been asked before. I came across something in a rewatch of GoT (no spoilers ahead).
I realized the curved spike on the top of unsullied helmets could possibly be used as some sort of dagger-like device. Say, for instance that your spear, sword, and shield are no longer with you because you've used them and cannot recover them. But, your helmet (that's strapped to your head) has a spike that could be used as a backup.
So my question is, is there evidence that armies have used helmets specifically in the case of offensive use- something that their soldiers were trained to use in case they no longer had their conventional weapons?
This is not to be confused with using a helmet as a last resort, like a rock, stick, etc. We've all seen instances in war movies where soldiers have used a regular domed helmet to kill because they had nothing else.
I couldn't think of any off the top of my head so I thought someone here might have an answer!
Source: reddit post