Who was the greatest?

[Villiamza]

Back to the original question & keeping limited resources in mind, for me it would have to be the commander of the forgotten army.
Field Marshall Viscount Slime, know affectionately by the men under him as "Uncle Bill"

"when you go home
Tell them of us and say
For your tomorrow
We gave our today"

Inscription on the 2nd Division war memorial at Kohima

Field Marshall Erwin Rommel would be my second choice.

 

[Big Joe]

If Josef Stalin were asked who his favorite commander was I wouldn't be surprised if he said Hitler.