The Sentries are raised by fearsome leaders and put through rigorous training during the period of Knighthood. Until they are put into the battlefield, they are to experience pain and torture to the point where they can withstand even the deadliest blows. Their inhumane physique has earned their place at the front ranks of any decent army.
The Sentry is a slower moving, defensive infantry unit. They are able to fend off and absorb attacks from other infantry units, which makes them capable of being positioned as the primary defenders of your army. They also have the highest haul capacity for carrying resources. Unfortunately, they do not do as well when up against cavalry, and have a lack of offense compared to other infantry units.