Military post offices on the Salolica front. Cover posted from "VOJNA POSTA*Br.VIII*5.9.18" fr. with 5c5c. (foreign letter rate) and canc. with "TRESOR ET POSTES*21 9 18" with Serbian censorship "PREGLEDALA/VOJNA CENZURA 21" in violet and French "CONTROLE par lAUTORITE MILITAIRE*4", via "VOJNA POSTA*Br.999*6.9.18", arr. "WEESEN*9.XI.18".