A Field Service postcard
sent by John William Slater to his mother Mrs D L Slater of 13 Granville
These Field Cards or form letters were issued to the troops
to allow them to send basic information to their families, the most vital that
the sender was alive.
The cards also made the censors job easier, but to
thwart the censors men could arrange a code by using various types of lines or
numbers of lines to convey a specific piece of news to the recipient.