The sarisa or sarissa () was a long spear or pike about in length. It was introduced by Philip II of Macedon and was used in his Macedonian phalanxes as a replacement for the earlier dory, which was considerably shorter. These longer spears improved the strength of the phalanx by extending the rows of overlapping weapons projecting towards the enemy, and the word remained in use throughout the Byzantine years to sometimes describe the long spears of their own infantry. Composition and utility The sarissa, made of tough and resilient cornel wood, was very heavy for a spear, weighing approximately . It had a sharp iron head shaped like a leaf and a bronze butt-spike, which could be anchored in the ground to stop charges by the enemy. The spike was sharpened well enough to pierce an enemy shield. The bronze material of the butt-spike prevented it from rusting. The spike also served to balance out the spear, making it easier for soldiers to wield, and could be used as a back-up point should the main one break. The sheer bulk and size of the spear required the soldiers to wield it with both hands, allowing them to carry only a shield (pelta) suspended from the neck to cover the left shoulder. Its great length was an asset against hoplites and other soldiers bearing shorter weapons, as they had to get past the sarissas to engage the phalangites. However, outside the tight formation of the phalanx, the sarissa was of limited utility as a weapon and a hindrance on the march. As such, it was usually composed of two lengths and was joined by a central bronze tube only before a battle. The two parts were carried on the soldier's back during these marches. Tactics Complicated training ensured that the sarissophoroi wielded their sarissas in unison, swinging them vertically to wheel about, then lowering them to the horizontal. The uniform swish of the sarissas daunted the Illyrian hill tribesmen against whom the young Alexander fought in an expedition early in his reign. The sarissa-bearing phalanx would usually march to battle in open formation to facilitate movement. Before the charge, it would tighten its files to close formation or even compact formation (synaspismos). The tight formation of the phalanx created a "wall of pikes", and the pike was so long that there were fully five rows of them projecting in front