Military post offices on the Salolica front. Military French PS posted without stamp from "VOJNA POSTA*Br.414*23.6.16" in violet, via "VOJNA POSTA*BR.999*24.6.16". On arrival taxed with 10c. Swiss stamp and cancelled with "AROSA*28.VII.16". During this period the French did not charge any potsage due on foreigh postcards. The Swiss have charges it at double the domestic rate.