It was an inspiration for the actual battle map and the atmosphere. Didn't have much time for this so done in quick style.
Even if it is done in quick style this still a fantastic piece of work. i love the amount of detail that is there and better still implied. It manages to say so much.
I also like the way that in bits we can still see some of the sketch lines that you used to built the drawing up. Gives a bit of an insight in to how you work.