So the objective of the main attack from Anzac was simple; but the means of approach presented extraordinary difficulties. As at Anzac itself, the front of the range breaks down to the sea in a crumbled and complicated formation of edges, ridges, spurs, cliffs, and ravines, the haphazard and perennial work of winter storms and rains acting for ages upon soft sandstone and sandy deposits mixed with clay and a little chalk. This labyrinthine region naturally follows the north-easterly course of the hills out of which water has carved it, leaving a gradually extending plain along the seacoast as far as the low hills forming Nibrunesi Point, the southern extremity of Suvla Bay. Sometimes at night small parties of chosen New Zealand officers stole out to explore the labyrinth, and their reconnaissance was of the highest value. But the district had never been surveyed, and the tortuous watercourses, the unexpected cliffs and ravines, complicated by almost impenetrable and spiky bush, threatened inextricable error to any wanderer there, even by daylight and in peace. Imagine, then, the perplexity of threading those unknown ways in a total darkness haunted by the expectation of deadly fire at every turn in the ravines, from the blackness of every thicket, and the edge of every cliff! One or two Greek and Turkish guides were available, but employed without much confidence. For the better understanding of the great assault, the following points in the geography might be remembered. Proceeding by the Long Sap, then lately constructed, parallel with the seashore from Ari Burnu northward, soon after passing No. 1 Post one crosses Sazli Beit Dere, a dry watercourse on which the “Fishermen’s Huts” of the first landing stood. About 600 yards farther on, after passing No. 2 and No. 3 Posts, one reaches Chailak Dere, close to the mouth of which the “diviner” discovered copious subterranean water, as previously described. Both these Deres, or dry watercourses, run at right angles to the coast, coming down from the fort of Chunuk Bair by devious, zigzag courses, but generally parallel in direction, though the upper courses tend to converge. The steep and lofty ground standing between the two Deres is marked by the three points of Old No. 3 Post, Table Top, and Rhododendron Spur, which runs up to the shoulder of Chunuk Bair itself.