Wait for Zero Hour in the Battle of Hamel. Percy experienced this one from the sidelines. Learn about camouflage counter battery work, tanks, new kinds of shells, sneezing gas, German prisoners and much more. Here is a bit of it:

"Suddenly the captain sat up and exclaimed, "It's quarter of a minute past zero and the bombardment hasn't started!" We tumbled out of the dug-out in order to witness the strafe, and, even as we did so, a machine gun started chopping the air on our left, and the next instant the valleys and ridges behind us broke forth into a vast rumbling roar, the sky dancing with the multitude of lightning-like flashes from our guns. I jumped on to the nearest fire-step in time to see the first red light go up from the German lines. It was followed by many more all along our front, and by green ones, and also the pretty orange clusters and the ordinary white illuminating flares. Less than a mile in front of us the barrage from our guns descended in a mighty uproar on the German lines. Great columns of smoke, lit up by the many varied lights, arose from the bursting shells and drifted lazily across to the right"