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Rewrite this with the focus being on Mark Twain's connection to Ulysses Grant.

In June 1861, shortly after the Civil War began, 25-year-old Clemens joined the Marion Rangers, a pro-Confederate militia. Although his family had owned a slave when he was a boy, Clemens didn’t have strong ideological convictions about the war and probably enlisted with the militia primarily out of loyalty to his Southern roots. His time with the group turned out to be brief: After two weeks of conducting drills, the poorly supplied Marion Rangers disbanded upon hearing a rumor that a Union force—led by Ulysses Grant, as Clemens eventually learned—was headed their way. The following month, Clemens left Missouri and the war behind and journeyed west with his brother Orion, who had been named the territorial secretary of Nevada. Once there, Clemens tried his hand at silver mining and then, after failing to strike it rich, took a job as a reporter with a Virginia City, Nevada, newspaper in the fall of 1862. The following February, he used the pen name Mark Twain for the first time. Prior to that, he had tried out other pseudonyms, including W. Epaminondas Adrastus Blab and Thomas Jefferson Snodgrass.

As it happened, later in life Clemens became friends with Ulysses Grant, and in 1885 published the former president’s memoir, which became a best-seller and rescued Grant’s widow from poverty after her husband lost most of their money to bad investments.
gpt
In June 1861, shortly after the Civil War began, 25-year-old Mark Twain - then known by his given name Samuel Clemens - joined the Marion Rangers, a pro-Confederate militia. His family had owned a slave when he was a boy, but Twain himself didn't have any strong ideological convictions regarding the war and it's thought that he joined the Rangers out of loyalty to his Southern roots. After spending two weeks conducting drills, the poorly supplied Marion Rangers learned that a Union force was headed their way. They disbanded and the following month Twain headed out west with his brother. Twain later learned that Ulysses S. Grant was leading the force that intended to break up the Rangers.

Years later, Twain became friends with Ulysses Grant and even published the former president's memoir. The best-selling memoir became a saving grace for Grant's widow after her husband lost most of their money to bad investments. 