 Kọ itẹsiwaju fun paragirafi yii - Lestwitz bẹrẹ iṣẹ ologun rẹ ni ọdun 1734 gẹgẹbi Fahnenjunker ni ọmọ ogun ẹlẹsẹ ti Kurt Christoph von Schwerin ni Frankfurt lori Oder. Ninu Ogun Silesian Akọkọ ati Keji, Lestwitz kopa ninu diẹ ninu awọn ogun ti o gbona julọ: Mollwitz, Chotusitz, Hohenfriedberg, ati Soor. Nínú Ogun Ọdún Méje, lẹyìn Ogun Lobositz : 1 October 1756, ó gba Òfin Pour le Mérite. 