When the Corps Commanders began working out the details two of the greatest problems were transport and water. Only patience and skilful development of known sources of supply would surmount the water difficulty, and we had to wait till the period of concentration before commencing its solution. But to lighten the transport load which must have weighed heavily on Corps Staffs, the Commander-in-Chief agreed to allow the extension of the railway east of Shellal to be begun sooner than he had provided for. It was imperative that railway construction should not give the enemy an indication of our intentions. If he had realised the nature and scope of our preparations he would have done something to counteract them and to deny us that element of surprise which exerted so great an influence on the course of the battle. General Allenby, however, was willing to take some risks to simplify supply difficulties, and he ordered that the extension to a railway station north-east of Karm should be completed by the evening of the third day before the attack, that a Decauville line from Gamli, not to be begun before the sixth day prior to the attack, was to be completed to Karm by the day preceding the opening of the fighting at Beersheba, and that a new Decauville line should be started at Karm when fighting had begun, and should be carried nearly three miles in the Beersheba direction early on the following morning. These new lines, though of short length, were an inestimable boon to the conductors of supply trains. The new railheads both of the standard gauge and light lines were well placed, and they not only saved time and shortened the journeys of camel convoys and lorry transport columns, but prevented congestion at depôts in one central spot.