Doppelsöldner were Landsknechts(German Mercenary) in 16th-century Germany who were prepared to fight in the front line, taking an extra risk, in exchange for double payment.
Landsknechts were trained to use of the Zweihänder(two-hander), a massive two-handed sword around 6 feet long(bigger than claymore which were around 4' 7") weighing up to 7 pounds
The Zweihänder was used by Doppelsöldners to break through formations of pikemen(pikes are massive spears around 20 feet long), especially Swiss pikemen.(Swiss pikemen were famous for discipline; they were the elite of the elite) They did this by either swinging to break the ends of the pikes themselves or to knock them aside and attack the pikemen directly.*Some information were taken from wikipedia
