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* several technologies and agricultural practices led to a tremendous increase in crop yields in Europe starting around AD 900 | * several technologies and agricultural practices led to a tremendous increase in crop yields in Europe starting around AD 900 | ||
** which led to population increases | ** which led to population increases | ||
** which led to growth of feudal manors | |||
* "three field" system (see Manor system for more) yielded more crops | |||
* iron technologies | |||
** iron horse collars and shoes made them more effective | |||
** iron plows | |||
* these skills all contributed to efficient and expert development of weapons of war for knights | |||
* | * | ||