Uruk-hai were bred by Saruman by his dark arts in the pits of Isengard. The Uruks in the service of Saruman used the symbol of the White Hand of Isengard, featured on their banners, helmets, and faces. They were led into battle at Helm's Deep by Uruk Commanders, who were more strategically sound. Uruk Berserkers were larger, even more fearsome versions of the Uruk-hai. Before they were sent into battle, it is said that the bowl of their small, tight-fitting helmet was filled with the blood of their enemy, and then pushed onto their heads. The intoxicating smell awakened a blood-lust that drove them to a battle-frenzy and made them immune to pain.
Original deck by Geektopia available here.