What is the main conflict in Ghost Soldiers: The Epic Account of World War II's Greatest Rescue Mission by Hampton Sides?

In 1942, following the outbreak of World War II, the Japanese assaulted the Philippine islands and ultimately captured them. This action resulted in many prisoners of war as the American Navy was unable to evacuate most soldiers. Many thousands of prisoners were interred in the Cabanatuan Camp where they languished without medicine, adequate food, or other supplies. In 1945, American forces were recapturing Luzon. Fearing the Japanese would massacre the approximately 500 surviving prisoners of war at Cabanatuan, a rescue mission was successfully carried out.