 Complete the following phrase:  The Dry Tree or Solitary tree is a legendary tree. The first recording about it was done by Marco Polo, somewhere in the wastelands of northern Persia. According to Polo, it was the only tree within hundreds of kilometres of desert. The legend said that the Dry Tree marked the exact spot of the great battle between Alexander the Great and Darius. It is not clear whether this great battle refers to the battle of Issus or of 