Sun Tzu's five rules for recognizing the class of situations where defensive unity is destroyed.
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This article explains how to recognize a situation where a competitor or rival is mounting a large, well-organized attack on our existing position. Given its size and power, this invasion is very likely to be successful. At the very least, the confrontation with this opponent will be difficult and expensive. We are forced to defend our existing position within our own territories. The main problem here is not the rival, but the internal division that the threat causes.