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57.)]

48. On open ground, I would keep a vigilant eye on my defences.

On ground of intersecting highways, I would consolidate my

alliances.

49. On serious ground, I would try to ensure a continuous stream

of supplies.

[The commentators take this as referring to forage and plunder,

not, as one might expect, to an unbroken communication with a

home base.]

On difficult ground, I would keep pushing on along the road.

50. On hemmed-in ground, I would block any way of retreat.