Shaiba south-west of Basra. The real attack was on Shaiba, and the battle lasted from 12 to 15 April. The Turks were completely defeated, with some 6000 casualties; but the most important effect was to convert the Arabs into our allies. The advantage was pressed in June, and on the 3rd Amara was captured seventy-five miles to the north of Kurna. The way was open for an advance on Baghdad as soon as autumn made exertion possible in that torrid zone (see Map, p. 177). Sir John Nixon's success in the Mesopotamian delta was, however, but a pin-prick in a distant part compared with the blow that was aimed at the heart of the Turkish Empire in the Dardanelles; and the merits of that famous but ill-starred enterprise, and of the strategy which inspired it, have been one of the most debated questions of the war. Soldiers and civilians, writers and talkers, and even thinkers were divided into two camps, Westerners and Easterners, those who believed that the war could only be won by frontal attack in the West, and those who discerned a way round to victory in the Near or the Farther East. Volumes might be, and no doubt will be, written on this controversy, and its implications have infinite variety. It involved questions of policy as well as strategy, and therefore raised the delicate problem of the relations between civil and military authority. The soldier only deals with armies, and in the field his voice is properly supreme; but policy may be as far above strategy as strategy is above tactics; and policy may dictate a strategy which would not commend itself on military principles. The soldier has nothing to do with the policy, but policy and diplomacy may or may not bring fresh allies into the war and fresh armies into the field; and a strategy which may be unsound on purely military grounds may be completely justified by political reasons. The diversion of a force from the main field of operations where it is needed to a more distant objective, seems suicidal to the general in command; but if, without provoking disaster on the field it has left, it has the effect of turning the enemy's flank, detaching his actual or deterring his potential allies, and inducing neutrals to intervene, it may win a war although it postpones or risks the success of a campaign.