It came down from Maan, a water-train, and passed over the mine without accident. The Arabs thanked me, for a booty of water was not their dream. The mine-action had failed; so at noon, with my pupils, I went down to lay an electric mine over the lyddite, that the detonation of one might fire the other. For concealment we trusted to the mirage and midday drowsiness of the Turks; justifiably, for there was no alarm in the hour we spent burying the charge.

From the southern bridge we brought the electric leads to the middle bridge, whose arch would conceal the exploder from a train overhead. The Lewis guns we put under the northern bridge, to rake the far side of the train when the mine went off. The Arabs would line the bushes of a cross-channel of the valley three hundred yards our side of the railway. We waited afterwards throughout a day of sunlight and flies. Enemy patrols marched actively along the line morning, afternoon and evening.