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		| Sombre said: 60 PD may be technically inefficient and a bad move
 
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  It's not always a bad idea though, PD has it's own advantages that a normal army doesn't. For example, it's unaffected by sites which spread disease, thus if you're unlucky enough to find Inkwell End or similar in a key chokepoint then it's cheaper in the longterm to invest in high PD rather than constantly be replacing defenders, especially if you're a resource heavy nation.