[PzLdr]

I've read that the height requirement for a Roman legionarie was 5'10".

[Melas]

I'd question that figure. The requirement to be Roman Cavalry was 5'8", so legionaires would have a considerably lesser requirement.

[muir_redwoods]

Our unit of measure, the mile is short for Mille Passum or 1000 paces. One can see that the pace, two steps, usually equal the walker's height. A mile being 5280 feet means the average marching Roman was 5.28 feet tall or 5'3-1/2"