Context: Australia had been shocked by the speedy collapse of British Malaya and Fall of Singapore in which around 15,000 Australian soldiers became prisoners of war. Curtin predicted that the "battle for Australia" would now follow. The Japanese established a major base in the Australian Territory of New Guinea in early 1942. On 19 February, Darwin suffered a devastating air raid, the first time the Australian mainland had been attacked. Over the following 19 months, Australia was attacked from the air almost 100 times.

Question: About how many Australians were taken prisoner after the fall of Singapore and British Malaya?
Answer: 15,000

Question: In what year did Japan establish a base in New Guinea?
Answer: 1942

Question: What date was the Australian mainland first attacked?
Answer: 19 February

Question: What mainland Australian city was attacked by the Japanese on February 19?
Answer: Darwin

Question: For how many months was Australia attacked from the air by Japan?
Answer: 19