 He had malaria. People didn't fully understand what was malaria and how to treat it. There are battles to come. Chamberlain, remember, he's 34 years old. He speaks nine languages. He's a professor esteemed with an invitation to Europe for two years on pay. He's got a wife and two children and a position of great authority back in Maine. And he's coming back to war. The book is On Great Fields, The Life and Unlikely Heroism of Joshua Lawrence Chamberlain.