Extensive Research
It was his extensive research that led Freeman to the conclusion that the Japanese had a medical facility somewhere in that area of the jungle. He read old diaries and battle maps, studying everything he could about the area and war. Thus, he had his suspicions that the Japanese had some sort of medical facility during their advance. However, the location of the said facility remained a complete mystery until then!
Extensive Research
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Confirmation
What confirmed Freeman’s theory was when they came across some very interesting evidence. Thus, he could properly conclude that there had been a Japanese hospital there in September 1942.
Confirmation