Before entering into details, let us imagine ourselves to be standing on one of the mountains round about Jerusalem.[1] Away to the north, Mount Carmel rises abruptly from the sea. Thence the chain of Carmel runs S.S.E. for some 20 miles, dividing the Coastal Plain from the Plain of Esdraelon. About Dothan and Tul Keram it merges in the range comprising the mountains of Samaria and Judaea, which range runs north and south through the land like the backbone of a fish, with steep spurs, like ribs, thrown out on either side towards the Coastal Plain and the Jordan Valley. Westwards, we look down upon the cultivated plain, and across it to the golden belt of sand dunes, tapering like the waist of an hour-glass where the olive plain touches the sea at Jaffa; beyond, lies the deep blue of the Mediterranean. Eastwards is a sheer abyss falling into the Jordan Valley, where that river, like a silver thread, winds its way along until it falls into the Dead Sea. Beyond, as if across a fifteen-mile moat, rise abruptly the mountains of Moab. The map of Palestine might be aptly compared to a bridge marker. The horizontal line is the plain of Esdraelon. In vertical columns "below the line" lie the strips of the country which we have just described. "Above the line" are the mountains of Lebanon, Tabor and Hermon, Galilee and the Sea of Tiberias, and the valleys and rivers of Damascus. Let us consider these zones in greater detail, more especially with regard to their influence on war. The sea, which skirts Palestine throughout its length, confers a twofold advantage upon her mistress. In the first place, it provides a supplementary line of communication. We have already seen that, during the advance across the Desert, sea-borne supplies from Port Said were landed at El Arish. This method was continued throughout our advance in Palestine, and landing places were improvised at various convenient stages. There is no good harbour along this coast; and landing, which has to be done by beach boats, is difficult, especially in a westerly wind. Nevertheless, considerable supplies were thus landed, chiefly of fuel and fodder, which would be little liable to damage by immersion. In the second place, help can be given during actual military operations by the Navy. Our ships frequently lay off the coast and bombarded the enemy's positions. Of necessity, each side had a flank resting on the sea. To the British, this was a feature of strength; to the Turk, it was one of weakness. He was compelled therefore at all times to draw back or "refuse" his coastal flank, while the British flank was constantly thrown forward menacing the flank of the enemy.