Written by Major R.E.Priestley MC, R.E. and dated 1921.
Some of the topics are; Pre-War Signals, Signals in the Battle of the Marne, at the Battle of Ypres-Armentieres, Ennemy Overhearing, Signals in the Somme Offensive, Signals in the Battles of 1917, and more.

From the American Libraries Internet Archive.
Joe

http://www.archive.org/details/signalserviceine00prie