This monument was erected by Aemilius Paullus in 168 BC after his victory over King Perseus in the Battle of Pydna. Nothing is left today of this monument which once stood before the Temple of Apollo except for the frieze blocks. The friezes, now housed in the Delphi Museum, show the battle at Pydna between the Romans and the Macedonians. Although the subject of the "battle scene" is not a new one, little information is left today regarding the actual friezes themselves.
Scenes from the Pydna Monument, erected by Aemilius Paulus
From: http://members.nbci.com/_XMCM/thrace/pydna.htm which has a much fuller treatment.