Main Entry: re?en?act
Pronunciation: "rE-&-'nakt
Function: transitive verb
Date: circa 1676
1 : to enact (as a law) again
2 : to act or perform again
3 : to repeat the actions of (an earlier event or incident)
- re?en?act?ment /-'nak(t)-m&nt/ noun

Or in plain language...

Reenactment: a phenomenon which is not known to everyone. The term excists of two parts, where 'enactment' is the most important. Put 're' in front of it and we have re-enactment. And that is exactly what all workgroups do with battles: reenact.