According to Wikipedia until 1870 it was generally believed in western Europe that the story wasn't real and that the city of troy never existed.
Some historians believe that the story of the siege of troy , which is based on Homer's lliad, is just a fictional story that never happened. Most of those historians however believe that the city of Troy actually existed.
Some historians believe that Troy's siege was a real historical event. Those historians believe that parts of the story are true.
The archaeologists Heinrich Schliemann and Frank Calvert claimed that troy was located at Hissarlik, an archaeological site in Turkey. Most historians , including the ones who don't believe the war took place, now believe that this place has the ruins of Troy.
According to Wikipedia the Greeks treated the story as a real historical account of a war that actually took place. See also why some people loved the movie troy.
The Greeks believed that the war took place in the 13th or the 12th Century. Modern historians ,who believe in the story, believe it took place in either the 11th or the 12th century.
some Greek historians believed that Homer exaggerated the story in his poems to suit the writing needs.
Up to this day there is no evidence that Achilles or Helen existed. There is also no evidence to deny their existence.
According to many historians , who believe in the story, the war was long and spanned many years.
Some people believe that Homer was using a metaphor when he referred to the Trojan horse and that the Trojan horse never existed.
According to some historians the city of Troy was raided often due to its attractive location. The city was destroyed and built many times and so there was more than one war.