We also forget that Israel’s occupation of the West Bank was entirely unsought. Israel begged Jordan’s King Hussein to stay out of the conflict. Engaged in fierce combat with a numerically superior Egypt, Israel had no desire to open a new front just yards from Jewish Jerusalem and just miles from Tel Aviv. But Nasser personally told Hussein that Egypt had destroyed Israel’s air force and airfields and that total victory was at hand. Hussein could not resist the temptation to join the fight. He joined. He lost.
http://www.realclearpolitics.com/articles/2007/05/for_israel_there_was_no_peace.html