Why Btonze Age?

[abaris]

Hey, Polish cavalry attacked the German in 1939.

It was ineffective.

The Germans had cavalry too in WWII. But the horses no longer served as chargers. They only served as means of transportion for the soldiers to dismount when action started. But they were still called cavalry. As far as I know, even the US forces found it hard to let go of the tradition. Weren't or aren't there still units being called cavalry, although there are no longer horses but copters involved?