with the configuration of the country, yet he will not be able to turn
his knowledge to practical account.
[Literally, "get the advantage of the ground," which means not only
securing good positions, but availing oneself of natural advantages in
every possible way. Chang Yu says: "Every kind of ground is
characterized by certain natural features, and also gives scope for a
certain variability of plan. How it is possible to turn these natural
features to account unless topographical knowledge is supplemented by
versatility of mind?"]