Answer:
The reason for this "Trojan War" was, according to Homer's "Iliad," the abduction of Helen, a queen from Sparta. This abduction was done by Paris, the son of Troy's King Priam. Throughout the "Iliad" the gods constantly intervene in support of characters on both sides of the conflict.
King Priam, Hector's father, then went to Achilles to beg for his son's body so he could give it a proper burial. Despite the abuse of the corpse at the hands of the Greeks, Hector's body had been kept intact due to the intervention of the gods.