Murad, when not engaged in war, devoted himself to perfecting the organization of his army on the lines laid down by his father, Orchan. He also created a new standing corps of soldiers, recruited from the Christian population of the provinces conquered in Europe. This was the renowned corps of Janissaries—the new army. Von Hammer and other historians following him, and more recently Sir Edwin Pears, give very full details as to the constitution of this corps and the motives of its founder. They state that one thousand lads, between the ages of ten and twelve, were in every year conscripted from amongst the children of Christian parents. The most physically strong and intelligent of them were taken. They were forcibly converted to Islam, and were trained with great care for military careers under the immediate direction of the Sultan. After six years of training they were drafted into a special corps, which reached, after a few years, a maximum of twelve thousand men. The discipline of this corps was very severe. It formed the most efficient and reliable body in the Ottoman army. The men looked on their regiment as their home. Their lives were devoted to it. They were not allowed to own property. What they acquired belonged to the regiment. They were not, till a later period in the history of the Empire, allowed to marry. They formed the backbone of the Ottoman armies in war; and in many a hard-fought battle, when disaster and defeat were imminent, they saved the army by their intrepid and persistent stand against the enemy. The object which Murad aimed at is said to have been not merely the strengthening of his army by a standing force of this kind, but that it should, by its personal devotion to the Sultan, act as a check on his other turbulent forces.[5] Sir Edwin Pears says of this force:— Take a number of children from the most intelligent portion of the community; choose them for their strength and intelligence; instruct them carefully in the art of fighting; bring them up under strict military discipline; teach them to forget their childhood, their parents, and friends; saturate them with the knowledge that all their hope in life depends upon their position in the regiment; make peace irksome and war a delight, with the hope of promotion and relaxation from the hardship and restraints of the barracks; the result will be a weapon in the hands of a leader such as the world has rarely seen. Such a weapon was the army of the Janissaries.[6]