Upon his return, Aristia took up the cause of Greek nationalism, joining the Filiki Eteria and flying the "flag of liberty" for the Sacred Band. He fought on the Wallachian front during the Greek War of Independence, and was probably present for the defeat at Drăgășani. He escaped the country and moved between various European countries, earning protection from the Earl of Guilford, before returning to Bucharest as a private tutor for the Ghica family. Aristia used this opportunity to teach drama and direct plays, and thus became one of the earliest contributors to Romanian theater. A trendsetter in art and fashion, he preserved his reputation even as Wallachians came to reject Greek domination. He adapted himself to their cultural Francization, publishing textbooks for learning French, and teaching both French and Demotic Greek at Saint Sava College.