I don't know too much, but I have heard some details from my great-grandpa. He married while on furlough in early 1864 and seemed to straighten up after that. Sometime in 1865, he was appointed sergeant. It's also claimed that he was shot in the head at the Battle of Shiloh. After the Civil War, he became a devout Christian and spent a lot of his time and money on helping the needy. He was also known to have an interest in politics. Though, I can't find official records relating to it; several sources claim he was the leader of the local Republican Party. Through questionably legal gambling, sometime after the Civil War: George obtained a thousand-acre tobacco farm. Despite his prior money troubles, this acquisition had him set for the rest of his life. He passed in his sleep at the age of 80, on October 27th, 1921.
In "A History of Adams County, Ohio," Nelson W. Evans claims that George W. Lewis fought at the battles of Shiloh, Cheat Mountain, Perryville, Stone River, Chickamauga, Missionary Ridge, Lookout Mountain, and others. Oddly, Evans claims that George enlisted on May 27th, while official records say June 13th. His farm is owned and operated by his direct descendants: though it's only a tenth of the original size. I had the fortune to grow up on that farm, and it's probably what got me into history. Supposedly, he carried a silver dinner knife around with him. One day, he stuck the knife in one of the dining room walls; and it was left there for a hundred years before my parents decided to remove it. I've always wondered if there's any context to the story, but I can't imagine what it would be.