Fang Zhengzhi had never liked to waste things.
He always felt that even something as small as a nail would have its use. If he had just thrown a few nails into the bush, that would have been too stingy.
He remembered a classic example recorded in the annals of history.
Han Xin seeked protection in Xiang Yu's army.
Once, Xiang Yu had set up an ambush for the Qin Army. They planned to trap the Qin Army in the mountain pass and attack with fire.
The difference was that Xiang Yu proposed to use fire arrows only whereas Han Xin suggested pouring oil before using the flaming arrows.
In the end, the difference in damage dealt was clear.
Throwing nails was the same idea. If it was in the bush, one should use green. If it was in the sand, one should use yellow. If it was at night, one should use black...
Else, it would be a waste.
