Physical description

6 letters dated as follows
.1) 23 November 1916
.2) 03 May 1917
.3) 15 November 1917
.4) 13 December 1917
.5) 10 January 1918
.6) 25th April 1918
.7) 03 October 1918
.8) 10 October 1918
.9) 17 October 1918