velkh aktsye carried aroys durkh knights makhmes zeyer pantser has persisted adayem ven keyner wears pantser ?

What action carried out by knights because of their armor has persisted to this day, when no one wears armor?

please note

sholem aleykhem ale dos vel zayn mine doyern eyns oyf a veynik days ikh bin running a feavor un mine vayb vilst mir arayn bet nu gebn mir a veynik days keyn flatern velkh a mol zayne un ikh vil zayn tsurikvegs mit der entfern

Hi everyone, this will be my last one for a few days, I am running a feavor and my wife wants me in bed. so give me a few days to shake what ever it is and i'll be back with the answer.

ira