Captain Hawkins - Field Command ability

[Pfr_Fate]

I would say you are right. Since the militia is discarded after its move, then the rule is self-limiting. Call-to-Arms is limited to four militia, so there just won't be that many militia to use Field Command upon as well.

Field Command: AS many times during the Move Phase as desired, limited by the number of available militia and Investigation. (Note: Call-to-Arms is an Action, not done in the Move part of the turn, so a player cannot create Militia, then throw them at a Minion, and then create more Militia.)