Maxmiilian III wuxuu ku dhashay magaalada Wiener Neustadt sanadkii 1558, wuxuu ahaa wiilka afaraad ee Emperor Maximilian II iyo Empress Maria ee Austria. Sanadkii 1585, wuxuu noqday Grandmaster of the Teutonic Order, ka dibna waxaa loo yaqaanay "Master German" ("der Deutschmeister"). 1587, wuxuu ahaa musharax u taagan carshiga Jamhuuriyadda Poland-Lithuania, qayb ka mid ah qabiilka reer Poland ayaa u doortay boqor. Si kastaba ha noqotee, natiijada ka dhalatay geedi socodkii doorashada ee jahwareerka leh, musharax kale ayaa sidoo kale la doortay. Maxmiilian wuxuu isku dayay inuu khilaafka ku xaliyo qaab milatari, isagoo sidaas ku bilaabay Dagaalkii Dhaxalka ee Poland. Inkastoo uu taageero weyn ka helay Poland, haddana ninka la tartamayay wuxuu soo jiitay taageerayaal badan. Kadib isku day fashilmay oo lagu weeraray Kraków dabayaaqadii 1587, Maximilian waxaa looga adkaaday Dagaalkii Byczyna
Bishii Janaayo 1588 ayaa la qabtay. Waxaa la sii daayay oo kaliya iyada oo loo marayo faragelinta Pope Sixtus V. 1589, wuxuu si rasmi ah uga tanaasulay sheegashadiisa taajka Polish. Sanadkii 1595, wuxuu adeerkiis Ferdinand II u guulaystay xilka Archduke of Further Austria iyo Guddoomiyaha Tyrol, halkaas oo uu ku caddeeyay inuu yahay taageere adag oo ka soo horjeeda Isbedelka. Maximilian wuxuu ku geeriyooday Vienna sanadkii 1618, waxaana lagu aasay xabaalkii Innsbruck Cathedral.