We have seen that the general formation of this range of mountains is like the backbone of a fish. We should therefore expect to find communications from north to south easy enough along the "spine" or ridge, but difficult on either side, where there would be a succession of "ribs" or spurs to be crossed. This is the case. There is only one first-class road from north to south through this hill-country, namely, that which runs along the ridge from Samaria through Nablus, Jerusalem, Bethlehem and Hebron to Beersheba. Communications from east to west are, however, more easy along the spurs and intervening valleys. To attempt an advance northwards, from spur to spur, is tedious work; after a comparatively short push a pause is necessary to enable roads to be constructed for bringing forward guns and supplies. We had an illustration of this in March, 1918, when a forward move of this character met at first with but moderate opposition. A pause of a few weeks was necessary to enable fresh roads to be made. In the meantime, the enemy had been heavily reinforced, and, when the next advance was attempted, stout resistance was encountered. This hill-country lent itself readily to defence. Mutually supporting heights could be held. A hill, when captured thus, became a focus for fire concentrated from all the hills around. So when the Turks attacked us in these hills they met with much less success than in the Jordan Valley; and, on the other hand, they were able to offer a stouter resistance to our attacks in these hills than they could on the Coastal Plain. The Jordan Valley, as we have already seen, is more than a thousand feet below the level of the Mediterranean, that is, below what we speak of as "sea level." In this respect it is unique in the geography of the world. In winter time the climate is equable; in summer it is unbearable. In peace time, even the Bedouin forsake it in summer. The district is pestilential to a degree, and, in no sense of the word, a white man's country. It possesses a feature of considerable importance in the river Jordan itself, almost the only river in Palestine with a perennial flow. The river is tortuous and rapid and not adapted to navigation. These features indicate this area as a difficult one in which to hold a fighting line, and a no less difficult one across which to maintain communications. In the summer of 1918, our line ran along the river valley, and the troops in this sector suffered much from diseases.