I te 1 o Poutu-te-rangi 1918, i whakawhitihia a Tadija Sondermajer ki te roopu toa toa French (GC 12) 'Les Cigognes' ('The Storks') te roopu rererangi toa pai rawa atu i Parani, i whakahaua e te rangatira rongonui o Parani a Georges Guynemer, ana i muri i te matenga o Guynemer, na tetahi rangatira nui ake <unk> te korero rongonui a Rene Fonck; hei tetahi o nga paerata toa toa 60, i tohua a Tadija kia uru atu ki te roopu e whakahaere ana i nga misioni whawhai tino uaua i te taha Hauauru i te pakanga o te Marne
He aha? Mai i te Paenga-whāwhā 15 ki te 21 o Mei, ko tana roopu hei hoariri mo te "Flying Circus" i hangaia e nga toa Fokker i arahina e te rangatira rererangi rongonui o Tiamana a Manfred von Richthofen, e mohiotia ana ko te Red Baron. I tetahi mahi i runga ake i te raina hoariri, i a ia e hoki ana ki te turanga me te pu miihini kore, i whakaekehia a Sondermajer e nga toa Tiamana e toru. I whakaorangia e ia a ia ano ma te whakatangitangi i nga mahi rere, i kore ai te hoariri e pupuhi ki a ia. I tana hokinga mai i te whawhai tuarua i te 21 o Mei, ka mura tana SPAD XIII i muri i tana pupuhi, he mea whakamiharo i taea e ia te taunga ki Flanders, i ora a Sondermajer i te hinganga o tana waka rererangi engari i tahuna kino ia me te whara i te waewae. Whai muri i te maimoatanga me te whakakorenga, i uru a Sondermajer ki te Kura o te Aeronautics me te Hanga Miihini i Paris (), i reira i whiwhi ai ia i tetahi tohu mo te miihini rererangi i te tau 1921. I te tau 1923 ka wehe ia i te mahi tika kia noho hei rangatira rahui.