Rashi on Beraishis 12 (6) says
And Abram passed through the land until the place of Shechem: to pray for Jacob’s sons when they would come to wage war in Shechem.
So Avrohom knew (prophetically) that Jacob’s sons would wage war in Shechem.
If he knew they would wage war, can we assume that he knew the outcome of the war too? And if he knew the outcome, what was the point of his prayer?
Does this mean that we have to understand that he had a limited prophecy; there would be a war but he did not know the outcome.
(Additional point – are there other examples of prayer for future events?)