LYCOS RETRIEVER 
Sauron: Rings
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Sauron knew that two Hobbits had been taken toward Isengard but he didn't know what had become of them. When Pippin Took looked into the Orthanc-stone on March 5, Sauron saw him and mistook him for the Ring-bearer. At first, Sauron thought this meant that Saruman had the Ring, and he proclaimed his intention to retrieve it.
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The only reason Sauron was 'killed' was because he had his ring chopped off. Voldemort of course, would not know of Ringlore, and so he would not think of chopping off Sauron's hand.
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Unknown to both Sauron and the Council, the One Ring had been found in 2941. The Ring had abandoned Gollum in order to seek its Master, but instead it was picked up by a Hobbit named Bilbo Baggins, who took it back to the Shire. Gandalf was aware that Bilbo had found a magic ring, but at the time he did not know that it was the One Ring. Bilbo passed the Ring on to his heir Frodo Baggins in 3001.
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Having seized and tortured Gollum, Sauron learned that the Ring had been found by a Hobbit named "Baggins." Sauron sent the Nazgûl to the Shire, Bilbo's home, but Bilbo and his heir, Frodo, had left. The Nine Nazgûl pursued Frodo and his companions and nearly killed Frodo, but were ultimately defeated.
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"It may seem unreasonable, unfair and downright mean-spirited to compare the Bush administration to the minions of Sauron, the granddaddy of evil in The Lord of the Rings trilogy. But here goes." 1/3
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If the Nazgul were Sauron's most terrible servants (as is stated a number of times) then it is natural to conclude that the Balrog did not serve Sauron. Unfortunately, this status of the Ringwraiths dates back to very early drafts of the story, and co-existed with the passages quoted above from Treason of Isengard where the Balrog apparently was a servant of Sauron;
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