The unit made an 800-mile trek over the Himalaya Mountains into the jungle with only the weapons and supplies they could carry on the 720 mules and horses they brought with them. The Marauders fought through monsoon season. Troops suffered from malaria, dysentery and typhus. Horn was wounded four times.

"There was no support. We didn't have any artillery. They just kept on knocking us down, whittling us down," he said in 2014. "It is hard to believe what we had to go through."

Horn — one of 1,200 soldiers who survived the Marauders' campaign — was awarded a Purple Heart. Each soldier also received a Bronze Star.

Despite his military heroics, when Horn returned to the reservation in June 1945, he said he was "treated like dirt."

Veterans were supposed to be given preferential treatment when applying for certain jobs and qualify for low-interest federal housing loans, but he said that almost never happened.

He worked on his grandparents' farm and received schooling in business management, psychology and legal work.