Meanwhile a Zulu 'impi' or army, numbering about twenty thousand men, or something more than one-third of King Cetywayo's entire strength, had moved from the Upindo Hill on the night of January 21, and taken up its position on a stony plain, a mile and a half to the east of Isandhlwana. The impi was made up of the Undi regiment, about three thousand strong, that formed its breast, or centre, the Nokenke and Umcityu regiments, seven thousand strong, that formed its right wing or horn, and the Imbonanbi and Nkobamikosi regiments, ten thousand strong, forming its left horn or wing. That night the impi slept upon its spears and watched in silence, lighting no fires. The king had reviewed it three days previously, and his orders to it were that it should attack number 3 column, and drive it back over the Buffalo, but it had no intention of giving battle on the 22nd, for the state of the moon was not propitious, so said the 'doctors'; moreover, the soldiers had not been 'moutied,' that is, sprinkled with medicines to 'put a great heart' into them and ensure their victory. The intention of the generals was to attack the camp at dawn on the 23rd; and the actual engagement was brought about by an accident. Before I tell of this or of the fight, however, it may be as well to describe how these splendid savages were armed and disciplined. To begin with, every corps had a particular head-dress and fighting shields of one colour, just as in our army each regiment has its own facings on the tunics. These shields are cut from the hides of oxen, and it is easy to imagine what a splendid sight was presented by a Zulu impi twenty thousand strong, divided into several regiments, one with snow-white shields and tall cranes' feathers on their heads, one with coal-black shields and black plumes, and others with red and mottled shields, and bands of fur upon their foreheads. In their war with the English many of the Zulus were armed with muzzle-loading guns and rifles of the worst description, of which they could make little use, for few of them were trained to handle firearms. A much more terrible weapon in their hands, and one that did nearly all the execution at Isandhlwana, was the broad-bladed short-shafted stabbing assegai. This shape of spear was introduced by the great king Chaka, and if a warrior cast it at an enemy, or even chanced to lose it in a fight, he was killed when the fray was over. Before Chaka's day the Zulu tribes used light assegais, which they threw at the enemy from a distance, and thus their ammunition was sometimes spent before they came to close quarters with the foe.