War horses interbred with draft horses. Thus, more horses were available for farmers, displacing oxen as draft animals. And increasing farm yields because of their superior speed.
graph TD HS[Horse strength] --> |More power| DH[Draft Horses] H[Horses] --> |More available| DH DH --> |Faster than oxen| FY[Farm Yields] style Inventions fill:yellow,stroke:#333,stroke-width:4px Inventions[Heavy plow<br/>Horse collars<br/>Horseshoes] --> DH
Source: Medieval Technology and Social Change by Lynn White
Last edited December 2021