Who is Corporal Trim from The Life and Opinions of Tristram Shandy and what is their importance?

Corporal Trim is Toby's servant. Like Toby, he fought in the war, but had to go home after he damaged his knee. He now dedicates his life to Toby upon whom he dotes. Despite his lowly position as a servant, Trim comes across as an intelligent man who is not shy to give his opinion on any subject. He often has good-natured arguments with Toby, in particular claiming Trim's injury is more painful than Toby's. However in reality, he shares Toby's kindness and humanity. The one bane in Trim's life is the probable death of his brother, Tom. Talking about his brother often results in Trim crying. Towards the end of the book, Trim courts Bridgett.