[ExI] surprise invention

[William Flynn Wallace]

(from Wikipedia)  .......was one of the basic tools
<https://en.wikipedia.org/wiki/Tool> used to create and spread modern
civilization <https://en.wikipedia.org/wiki/Civilization>, possibly as
important as the wheel <https://en.wikipedia.org/wiki/Wheel> or printing
press <https://en.wikipedia.org/wiki/Printing_press>.[4]
<https://en.wikipedia.org/wiki/Stirrup#cite_note-Baber_1996-4>
scroll down for answer after not coming up with anything,like me  bill w





the stirrup - enabled fighting from horseback
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