Many baseball players were drafted to fight in World War I in 1918, but Hornsby was given a draft deferment because he was supporting his family. During the offseason, Miller Huggins, unhappy with the Cardinals' management, left the team to manage the New York Yankees. He was replaced by Jack Hendricks, who had managed the Indianapolis Indians to a pennant in the American Association the previous year. Hornsby lacked confidence in Hendricks's ability to run the Cardinals, and the two men developed animosity towards each other as a result of Hornsby's growing egotism and fondness for former manager Huggins. Under Hendricks, Hornsby's batting average dipped to .281. He had problems off the field too; on June 17, Hornsby hit St. Louis resident Frank G. Rowe with his Buick when Rowe stepped out in front of traffic to cross an intersection. Rowe sued Hornsby for $15,000 ($ today), but Hornsby eventually settled for a smaller, undisclosed amount, and the case was dismissed. He was still among the league leaders in triples and slugging percentage in 1918, but after the season ended with the Cardinals in last place, he announced that he would never play under Hendricks again. Partially due to Hornsby's complaints, Hendricks was fired after the season and replaced by Branch Rickey, then president of the Cardinals.