stirrups and their impact on warfare

[MD]

Has anyone seen any studies on horse sizes of the period?

Have you seen [/url] recent thread ?
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The Phd thesis "A biometric study of equids in the Roman world" linked there deals with this topic. The thesis is split in five files, so you have to download:
http://www.york.ac.uk/media/archaeology ... hDvol1.pdf
to
http://www.york.ac.uk/media/archaeology ... hDvol5.pdf