Tuhia he tomokanga mo tenei waahanga - I te matenga o tona papa i te tau 1823, ka haere ia ki Spain i reira i whawhai ai ia mo te wa poto i roto i te whakaoho liberal ki te ture absolutist o Ferdinand VII; i mua i te mauheretanga e te ope French. I te tau 1825, kei roto ia i tetahi roopu o nga kaihauturu i whakauruhia e Colonel Charles Fabvier i Marseille ki te whawhai i te Pakanga Independence Greek. I tae atu ia ki Nauplion i te 1825, i te tuatahi i mahi ia i roto i te hoia eke hoiho a Colonel Auguste Regnaud de Saint-Jean d'Angély hei Trooper. I uru a Myhrberg ki nga pakanga i Euboea i te tau 1826, ka whawhai ia ki te whakamatau ki te whakaora i te Siege o te Acropolis i whara ai ia. I te tau 1826, i whakatairangahia ia ki te Lieutenant, i muri mai ka uru atu ki te pakanga i whara ai ia. I whara ia i te mahi mo te wa tuatoru i te Pakanga o Cape Colias, i whakatairangahia ia ki te Kapene i muri i tana mutunga. I te marama o Hanuere 1827, ka noho a Myhrberg hei kaihauturu a Fabvier, i muri mai ka mahi i taua mahi ano mo te Major General Thomas Gordon me Colonel Carl Wilhelm von Heideck. I uru a Myhrberg ki te Pakanga o Phaleron me te haerenga o Chios i reira i tino kitea ai e ia. I te 1829, i tohua a Myhrberg hei Kaiwhakahaere o te pa o Palamidi e Ioannis Kapodistrias. Na te kaha o te mana o te Rōpū o Ruhia, i wehe atu a Myhrberg i Kariki i te 1831 kia uru atu ki te Poari Poari o Poari. He iti noa te mohio mo tenei waa o tona oranga, e ai ki tetahi korero a Anders Ramsay, i whawhai a Myhrberg i te Pakanga o Ostrołęka
He aha? I mauheretia ia e nga Ruhia i tetahi wa i roto i te pakanga engari i kaha ki te mawhiti ki Prussia, i muri mai ka noho ki Parani.