How do you say what say 'Fact' is right? There will always be versions of story, many times completely contradictory. However, you caould have quoted at least a book that tells your version of the story. I am sure, in the case of Porus, European historians who did not want to show that their side got defeated in India, created the story of Alexander deciding to go back. It is quite possible that their defeat was largely because they were tired. (In my opinion, even if Alexander was really defeated in that war, he still has to be considered great because it is hard to imagine how people can come from so far places like Greece could come here and challenge us. No Indian king had achieved what Alexander had achieved