Well where to begin....
Medieval
1066 Norman Invasion Huscarl
1215 Teutonic Ritterbruder
ACW- 33rd Va Co E
50th New York Engineers Company A
13th Virginia Cavalry Company B
Washington Artillery Of New Orleans Company 1
Lee's "Light"Artillery
150th Pennsylvania Bucktails Company C and K
22nd Virginia Infantry Company K
WW2
5th Rangers Fox Company
there may be more.....