Wat Tambor was the Separtist Foreman of the Techno Union. Wat was Boba's first big assignment as an up-and-coming bounty hunter.
Boba tracked Wat to the planet called Xagobah where a war was going on between clone soldier's and the Separtists droids.
It was through the help of one of the planets native species, a Xamster named Xeran that Boba was able to gain access inside of the Mazariyan Citadel where Tambor was hiding.
Boba's plans to capture Wat Tambor were foiled twice, once by General Grievous and his droid bodyguards and second, by the skilled piloting skills of the Dark Jedi Asajj Ventress.