If you read James Bradley's "FLYBOYS" you will get a good in depth answer to your question. The short answer is that the conditions were horrible. The Japanese felt that they were a superior race and all other nations were treated with complete disregard. The pilots that this book follows were all killed by the Japanese that held them. Some within days of capture, one was alive for a couple months. As for the camps themselves the captured Americans were - as I understand - lucky to survive the ordeal. Minimal food, poor shelter, etc.
Take your pick: Jews, homosexuals, Eastern Europeans, the Chinese, general civilians... Acually the answer is the Jews in the European Theatre, and the American prisoners of War in the Pacific Theatre of War. The Japanese did NOT participate in the Geniva Convention, so they treated their prisoners horribly.
Aside from things like living conditions, food provisions and killing of prisoners of war, a big difference was the issue of forced labor. Nazi Germany never introduced forced labor for its (Western) Allied prisoners-of-war, while Japan did. A major cause of the very big difference in the general treatment was, that Germany treated captured soldiers simply as people who had fought and lost, while japan considered and treated Allied soldiers who had surrendered as people who had lost their honor and in consequence, any right to humane treatment. This shows in the fact that Germany had signed and largely adhered to the Geneva Convention regarding prisoners of war, while Japan never signed it, except for the treatment of wounded prisoners, the only kind of prisoners who in their view had retained their honor.
The Allies did not invade New Guinea. They protected it from the Japanese invasion that began in 1942.
From all I have read, which is extensive, it depends who you are and who you were fighting. US prisoners were relatively well treated as were Germans taken by the US. Exceptions were the German massacre of US prisoners in Malmady, battle of the bulge in 1944-45. The massacre of the Polish officers @ The Katyn Forest in 1940 by the Soviets, long blamed on the Nazis. Prisoners taken by Nazis on the Russian front were treated horribly if they were taken as were German prisoners captured by the Russians. About 5,000 Germans came back to Germany at war's end out of 500,000 taken Japanese were brutal in their treatment of all allied prisoners. Battaan's death march etc. War's do not bring out the best in men!
See: "Prisoners of the Japanese: POWs of World War II in the Pacific." (1996) by Gavan Daws; ISBN 0-6881-4370-9.
Very well
They were treated in accordance with the Geneva Convention. Australian prisoners of the Japanese were not.
They treated the US soldiers terribly.
The Australians treated the Japanese well in POW camps and gave them better food and water than the Japanese gave them, better shelter, medical attention, clothing and cigarettes.
Possibly the POW Camp in Bataan, as that was one of the first POW camps for the allies, and one of the first experiences for Japanese forces on the handling of Prisoners of War.
they was treated like allies
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Generally it was transported to & fro (In Europe at least) by the Red Cross. This applies to British & US forces. The Red Cross did much to ensure the safety and survival of hundreds & thousands of prisoners. There is then a vast contrast between on one hand the treatment of German & Italian prisoners held by the Allies & the Russian prisoners of the Nazis and the German prisoners of the Russians & similarly the Japanese Allied prisoners: The conditions were appalling. There were very few Japanese prisoners: Surrender wasn't an option.
W. E. Johns has written: 'No surrender' -- subject(s): British Personal narratives, Japanese Prisoners and prisoners, Personal narratives, British, Prisoners and prisoners, Japanese, World War, 1939-1945
Japanese POWs (prisoners of war) during World War II generally did not fight for the Allies. Instead, they were held captive by Allied forces, primarily in the Pacific Theater. While there were some exceptions of individuals who may have defected or collaborated for various reasons, the majority of Japanese POWs were not integrated into Allied military efforts and instead faced harsh conditions in captivity.
Cornelius van Heekeren has written: 'Moord en brand' -- subject(s): Dutch Personal narratives, Japanese Prisoners and prisons, Personal narratives, Dutch, Prisoners and prisons, Japanese, World War, 1939-1945 'Batavia seint' 'Helden, hazen en honden' -- subject(s): Japanese Prisoners and prisons, Prisoners and prisons, Japanese, World War, 1939-1945
The axis treated their prisoners horribly. They experimented on them and tortured them. They would burn them and make them freeze to death. they would hardly ever feed them and never give them showers.