A watan Agusta 1581, Alexander Farnese ya nada Charles na Arenberg a matsayin colonel na rundunar sojojin doki na Jamus. Ya ga aiki a lokacin yakin Cologne (1582<unk>1584), musamman a Siege na Godesberg (1583), ya shiga cikin sieges na
Antwerp (1585) da kuma Sluis (1587) kuma sun shiga yakin Farnese a Faransa (1590).