三国时期，曹操带兵攻打宛城，经过方城县一个叫梅林铺的地方。时值中午，烈日当空，天气十分炎热。曹操派人四处找水，始终见不到一滴水。士兵们全军都很口渴。为了不耽误行军，曹操灵机一动，站在高处，指着前面一个小山包说："前面就有一大片梅林，结了许多梅子，又甜又酸，可以用来解渴。"士兵们听后，嘴里都流口水一时也就不渴了，个个来了精神，加快行进速度，最后到达前方有水源的地方。
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