[Barrett]

The WW I memoir is "Sniping in France" by Maj. Hesketh-Pritchard, still printed by Lancer, I think. You might check the Sniper Country web site for additional sources.
Scout-sniper sections (as they were called) dealt in intelligence gathering as well as sniping. Marine Corps teams still use that terminology. The reason is that by definition the sniper needs good optics to do his primary job, but frequently observation and reporting are more important than shooting.
In WW I the Germans began with a decided technical and doctrinal advantage which lasted into 16. After that the Brits made a strong effort to redress the situation, and depending upon whom you read, either the war ended with the UK dominant or largely a standoff. Trouble on both sides was, it proved far easier to crank the field telephone attached to an arty battery rather than engage in countersniping.
Note that sniping does not always involve long-range shooting. I can usually make a first round hit on a 12x18 in. plate at 880 yds but most WW I sniping was well under 300 yds--often 50. The patience, skill and cunning required to put a round into a target only several inches square with a few seconds exposure time is of another magnitude. According to the Mel Gibson version of Gallipoli, "It tykes a speshul koind of man to myke a snoipah."
Stone the crows with your didgery-do, mate.