Nisei Baseball in Rohwer, AR During World War II, thousands of Nisei Americans were relocated to a War Relocation Authority camp in Rohwer, AR. In the camp, baseball was frequently played. Among those who were held at the camp was Nisei baseball star Masato Mauch Yamashita. Miscellaneous » Miscellaneous » Nisei Baseball in Arkansas » Nisei Baseball in Rohwer, AR