One American soldier called it ''a green hell on earth.'' Monsoon-soaked wilderness, debilitating heat, impassable mountains, torrential rivers, and disease-infested swamps - New Guinea was a battleground far more deadly than the most fanatical of enemy troops. Japanese forces numbering some 600,000 men began landing in January 1942, determined to seize the island as a cornerstone of the Empire''s strategy to knock Australia out of the war. Allied Commander-in-Chief General Douglas MacArthur committed 340,000 Americans, as well as tens of thousands of Australian, Dutch, and New Guinea troops, to retake New Guinea at all costs. What followed was a four-year campaign that involved some of the most horrific warfare in history. At first emboldened by easy victories throughout the Pacific, the Japanese soon encountered in New Guinea a roadblock akin to the Germans'' disastrous attempt to take Moscow, a catastrophic setback to their war machine. For the Americans, victory in New Guinea was t