The slightest miscalculation may easily lead to chaos—to the blocking of trains carrying wounded back and ammunition forward, or the deprivation of a few thousand men of their food at a critical moment. One should watch the arrival of the supply pack trains at the railheads where the supply columns of motor lorries or the divisional trains of horse transport unload the pack trains and load their vehicles, regularly each day at scheduled times, under all conditions, even those caused by a 14-inch enemy shell bursting at intervals of five minutes in the railhead yard, causing all and sundry to get to cover, except the A.S.C., who must never fail to clear the train at the scheduled time. One should watch the divisional train H.Q. at work, following its division and arranging for the daily correct distribution and the delivery of the rations to units. Often horse transport, by careful managing on the part of train H.Q., is released for other duties than those of drawing and delivering supplies to units. Then one may watch the A.S.C. driver delivering R.E. material, etc., to the line, along roads swept by high-explosive shell and shrapnel and machine guns, where all but the A.S.C. driver can get to ground, while he must stand by his horses and get cover for them and himself as best he can. Then, although one has only seen the skeleton framework of this vast service, and has had no opportunity to go into the technicalities of the system or to investigate the many safety valves of base supply depots, field supply depots, reserve parks and emergency ration dumps in the line, all of which are ready to come to the rescue should a pack train be blown up or a convoy scuppered, nor to study the wonderfully efficient organization of transport, covering mechanical transport, horse transport, Foden lorries and tractors which ply from the base to the line, carrying, as well as supplies, ammunition, R.E. material, and every imaginable necessity of war, and moving heavy guns in and out of position, at times under the very noses of the enemy, yet one cannot fail to have gained a great respect for that vast and wonderfully silent organization, the Army Service Corps. J. G. G. FRANCE, _May 1918_. CONTENTS PAGE PREFACE 5 INTRODUCTION 15 THE CLIMATE AT THE DARDANELLES 17 PROLOGUE—MARCH 1915 23 APRIL 25 MAY 62 JUNE 114 JULY 156 AUGUST 180 SEPTEMBER 218