Both Monty AND Patton were primadonnas. They both submitted plans to Ike which should have been based on the full support of all allied troops.

Ike chose Monty's plan and didn't have the guts to ensure that it was supported by Patton as well. He was the one really responsible for the defeat at Arnhem. If he had either chosen Patton's plan and forced Monty to support it, or if he had forced Patton to support Monty's plan (Which HE had chosen) then He would have stood a much better chance of victory.