A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
A player, 19 May 2015
I was wondering what exactly qualified as an infantry unit. Is it any non-cavalry unit or is it only a unit where neither the personality or followers have cavalry. If I had 2 Moto Yao-tsu at a battlefield and one had Fearless Heavy Infantry attached do I control both a cavalry unit and an infantry unit?
Note that a “Cavalry unit” is one in which the Personality and all Followers, if any, have the Cavalry keyword (see p. 63).
Infantry: This term refers to a Personality or Follower who does not have the Cavalry keyword. It is not itself a keyword.
A unit has a keyword (Cavalry, Ninja) when the Personality and all Followers each have that keyword.
Versatile Army This ability's Gold cost is 0 if you control both a Cavalry unit and an Infantry unit at this battlefield.
Alex Jones (rules official), 19 May 2015
I was wondering what exactly qualified as an infantry unit. Is it any non-cavalry unit or is it only a unit where neither the personality or followers have cavalry. If I had 2 Moto Yao-tsu at a battlefield and one had Fearless Heavy Infantry attached do I control both a cavalry unit and an infantry unit?
Note that a “Cavalry unit” is one in which the Personality and all Followers, if any, have the Cavalry keyword (see p. 63).
Infantry: This term refers to a Personality or Follower who does not have the Cavalry keyword. It is not itself a keyword.
A unit has a keyword (Cavalry, Ninja) when the Personality and all Followers each have that keyword.
Versatile Army This ability's Gold cost is 0 if you control both a Cavalry unit and an Infantry unit at this battlefield.
A Cavalry card is one with the Cavalry Keyword. An Infantry card one which is not Cavalry.
A Cavalry unit is unit in which the Personality and any Followers all have the Cavalry keyword. An Infantry unit one which is not Cavalry: that is, the Personality or at least one of his Followers is not Cavalry.