The Companions were Alexander the Great's elite cavalry, the offensive arm of his army and also his elite guard. They would be used in conjunction with his Macedonian phalanx. The Phalanx would "fix" the enemy into place and then the Companion cavalry would attack the enemy on the flank. Alexander would lead the charge with his cavalry, normally in a wedge formation. These troops would also protect the flanks of the Macedonian line during battle. The Companions would ride the best horses and receive the best weaponry available. Each carried a long thrusting spear (xyston) and wore a cuirass, arm protectors and helmet. Each horse was also partially armoured. As heavy cavalry the companions were Alexander the Great's decisive arm in battle.