He eventually reached Thessaloniki, then served as a second lieutenant in the Greek Army on the Macedonian front.

[2] During World War II, Katsimbalis served in the Greek army as an artillery lieutenant.

[2] Katsimbalis published 43 bibliographical works, 19 Greek and 14 foreign scholars, while already in 1925 he presented in London, a translation of poems.

Katsimbalis was introduced to Henry Miller in the late 1930s in Athens by their common friend and writer Lawrence Durrell.

[3] Patrick Leigh Fermor in an interview in 1978 said that George Katsimbalis' stories and friendship have greatly influenced his writings.