Nyasaland Field Force. 1918 Nyassa 20r, 25r, 100r and 200r each with central "NYASALAND / FF2" squared circle dated JY 3. The Nyasaland Field Force entered Portuguese Nyassa in November 1917 to pursue the retreating German forces, who finally surrendered in November 1918. During this period British forces could send mail free, but had to use Portuguese Nyassa stamps for payment of registration fees or parcel postage, and four sheets (200 stamps) of each value of the 1911 Nyssa stamps were supplied to the office at Mtengula for the use of the Nyasaland Field Force. (4). Photo on Page 56. (Image1)

Nyasaland Field Force. 1918 (July 4) Registered cover to Natal bearing Nyssa 21/2r, 5r, 75r, and 500r each cancelled "NYASALAND / FF2" squared circle with manuscript "R. Mtengula P.E.A", endorsed by the sender "On active service" and "No. 1388 Sgt G. Jones, S.A.S.C Supplies". Only about six covers recorded with Nyassa stamps tied by Nyasaland FF cancels. Very rare. Photo on Page 80. (Image1)