the command of Major Branch Rickey, the president of the St. Louis Cardinals. Other baseball players serving in this unit included Captain Christy Mathewson and Lieutenant George Sisler. All of these men were assigned to the Gas and Flame Division, where they trained soldiers in preparation for chemical attacks by exposing them to gas chambers in a controlled environment, which was eventually responsible for Mathewson's contracting tuberculosis, leading to his premature death on the eve of the 1925 World Series. On August 19, 1921, in the second game of a doubleheader against Elmer Myers of the Boston Red Sox, Cobb collected his 3,000th hit. Aged 34 at the time, he is still the youngest ballplayer to reach that milestone, and in the fewest at-bats (8,093). By 1920, Babe Ruth, sold to the renamed New York Yankees from the Boston Red Sox, had established himself as a power hitter, something Cobb was not considered to be. When his Tigers showed up in New York to play the Yankees for the first time that season, writers billed it as a showdown between two stars of competing styles of play. Ruth hit two homers and a triple during the series, compared to Cobb's one single. As Ruth's popularity grew, Cobb became increasingly hostile toward him. He saw the Babe not only as a threat to his style of play, but also to his style of life. Perhaps what angered him the most about Ruth was that despite Babe's total disregard for his physical condition and traditional baseball, he was still an overwhelming success and brought fans to the ballparks in record numbers to see him challenge his own slugging records. On May 5, 1925, Cobb told a reporter that, for the first time in his career, he was going to try to hit home runs, saying he wanted to show that he could hit home runs but simply chose not to. That day, he went 6 for 6, with two singles, a double and three homers. The 16 total bases set a new AL record, which stood until May 8, 2012, when Josh Hamilton of the Texas Rangers hit four home runs and a double for a total of 18 bases. The next day Cobb had three more hits, two of which were home runs. The single his first time up gave him nine consecutive hits over three games, while his five homers