A baseball series played 70 years ago between two U.S. internment camps became a symbol of freedom for a group of Japanese-Americans rounded up during the war.

The players, now octogenarians, are among the more than 120,000 Japanese nationals and Japanese-Americans who were forced into the internment camps by the U.S. government after the attack on Pearl Harbor in 1941.

Since some of the camps allowed internees to play baseball, they built makeshift diamonds and organized league matches that attracted thousands of spectators.