One of the most outstanding and important things taught in military text books is the value of striving to obtain "co-operation of all arms." That is to say, the more sympathy, good comradeship and understanding that exists between Infantry and Artillery and Cavalry and Tanks and Air Force people and so on, the more efficient each of these various arms becomes to carry out its respective duties. Knowledge of the general tactical principles under which each arm operates, and personal acquaintanceship with the various officers and men of such other units, all tend to cement combined operations into one smooth working whole for the pleasant efficiency of the combinations concerned and for the better (or worse!) confusion of the enemy. Such co-operation was an ideal often aimed at, but only too seldom actually accomplished. It required the best of officers and men to attain that perfect co-operation through understanding, which does not either fall short of or over reach the mark. The following notes written by Major C.E. Lawder, late commanding "A" Battery of the 168th Brigade, 32nd Division, Royal Field Artillery, reveals how smoothly things ran in that all important section of co-operation--that between Infantry and Artillery. In the eyes of those accustomed to military affairs the following statements will likely be recognised as perhaps the finest tribute that could be paid to the 17th H.L.I., for it is not so much an item of direct praise, as a sure indication of the high quality of efficiency attained by all ranks of the Battalion, not to mention the pleasant reflection given of "good humoured gentlemen." The 17th was ever proud to serve with the gunners of the 168th Brigade, whose fine shooting inspired confidence and courage:-- "We first met the famous 17th H.L.I. about New Year, 1916, in the La Boiselle Sector and much concern as to the pronunciation of the Scottish names given to the trenches was felt by my Yorkshire gunners--Sauchiehall Street in particular defeated them. They wished the Jocks would use Christian Huddersfield names! All my officers were much impressed by the great kindness and hospitality shown them by the 17th H.L.I. Messes when liaison Officer with the Infantry or when going round the front line, which we did constantly, myself as Battery Commander every third day, and the subalterns daily--all to try and get suggestions to better strafe the Boche and to show the Jocks that the gunners wanted to share the pleasures of the front line with our splendid Infantry.