The foreman of the Techno Union, Wat Tambor was one of the original and most fervent Separatist leaders, pledging his loyalty and his battle droid armies to Count Dooku at a pivotal meeting on Geonosis.
Later in the war, Tambor was appointed emir of Ryloth. His occupation was a cruel one, in which Tambor stripped the Twi'leks of whatever valuables he could find, then bombed their villages.
Wat Tambor spearheaded the invasion and occupation of Ryloth, setting up headquarters in the city of Lessu. Tambor hoped to pillage the city of its treasures.
Cham Syndulla led the native resistance against the Separatists. In contrast to the high tech droids of Wat Tambor's forces, Cham's Twi'lek freedom fighters road into battle atop blurrg creatures.
Tambor reported to Count Dooku throughout the Ryloth invasion. Tambor did not heed Dooku's advice to cut his losses and leave Ryloth before it was too late.
Backed by Cham Syndulla's resistance fighters, Mace Windu infiltrated the Separatist headquarters in Lessu and captured Wat Tambor at lightsaber-point.
As the foreman of the Techno Union, Wat Tambor was a powerful figure among the leadership of the Confederacy. It was his scientists that kept the Separatists equipped with the latest in weaponry.