Kammala wannan jumla: Kotun Saxon ta ba shi kwamiti, kuma a 1745 ya yi yaƙi a cikin
Yaƙi na Kesselsdorf a matsayin dragoon. Daga baya, ya tafi Netherlands a matsayin mataimakin Count Károly József Batthyány. A wannan matsayi, Mayr ya bambanta kansa a lokuta da dama, kamar a cikin kewaye da Bergen op Zoom, wanda aka mamaye a ranar 16 ga Satumba, 1747. A wannan shekarar kuma an nada shi "Rittmeister" (shugaban sojan doki) a cikin sojojin Saxon. A wannan lokacin, an rushe rundunonin da yawa a Saxony, kuma an sanya jami'ai da yawa a kan rabin albashi; Mayr ya fahimci iyakokin sabis a Saxony. Ya kasance daya daga cikin matasa da kuma sababbin jami'ai da kuma ci gaba zai zama da wuya a samu. Ya kasance a cikin aikin Field Marshal Count Batthyany har zuwa kammala yarjejeniyar Aachen a 1748.