Turkey-Ottoman-Palestine-29-7-1917 World War 1 censored German Military Mission Bir-Es-Seba Feld Post cover to Germany. This Field Post Office opened in Bir-Es-Seba on 6th October 1916 and closed on November 1st 1917 on being occupied by the Allied Forces. It was used as a staging field post office for the German troops fighting in southern Palestine and the Sinai Peninsula (Bale: M9).