The Knight is the fast unit of High Middle Ages. It has moderate damage and defense. It is effective against the ranged unit class but is vulnerable against the light class.
It is worth noting that at this point, Fast units start becoming a decent unit for stats. They have enough attack and defense to be used regularly. They also have a special ability, Chivalry, which gives them a +3 boost in both Attack and Defense only if it is the only unit with Chivalry (i.e. Knight and Heavy Knight) in army.
Knights should be used singularly in battles, to allow for Chivalry to take effect. Having multiple Knights requires all but one Knight to die before Chivalry takes effect.
Knights should be used to charge into enemy lines and kill ranged and artillery units.
Against Same Age Units