military revolution Some older histories have doubted the military and social innovations customarily attributed to Shaka, denying them outright, or attributing them variously to European influences. More modern researchers argue that such explanations fall short, and that the general Zulu culture, which included other tribes and clans, contained a number of practices that Shaka could have drawn on to fulfill his objectives, whether in raiding, conquest or hegemony. Some of these practices are shown below. Weapons changes Shaka is often said to have been dissatisfied with the long throwing assegai, and is credited with having introduced a new variant of the weapon: the iklwa, a short stabbing spear with a long, broad, and sword-like spearhead. Though Shaka probably did not invent the iklwa. He outsourced from Nzama, who later had a feud with him because Shaka did not want to pay for the spears. According to Zulu scholar John Laband, the leader did insist that his warriors train with the weapon, which gave them a "terrifying advantage over opponents who clung to the traditional practice of throwing their spears and avoiding hand-to-hand conflict." The throwing spear was not discarded but used as an initial missile weapon before close contact with the enemy, when the shorter stabbing spear was used in hand-to-hand combat. It is also supposed that Shaka introduced a larger, heavier version of the Nguni shield. Furthermore, it is believed that he taught his warriors how to use the shield's left side to hook the enemy's shield to the right, exposing the enemy's ribs for a fatal spear stab. In Shaka's time, these cowhide shields were supplied by the king, and they remained the king's property. Different coloured shields distinguished different amabutho within Shaka's army. Some had black shields, others used white shields with black spots, and some had white shields with brown spots, while others used pure brown or white shields. Mobility of the army The story that sandals were discarded to toughen the feet of Zulu warriors has been noted in various military accounts such as The Washing of the Spears, Like Lions They Fought, and Anatomy of the Zulu Army. Implementation was typically blunt. Those who objected to going without sandals were simply killed. Shaka drilled his troops frequently, in forced marches that sometimes covered more than a day in a fast trot over hot, rocky terrain. He also drilled the troops to carry out encirclement