I seem to remember the people referring to the Grey Company as 'Elvish Wights' as being people referring to them going into the mountains above Dunharrow and not coming out of them, and that would mean Rohirrim. I will have to check that. Thanks for letting me know, if it turns out I am wrong. :)

Hobbits and Ents both have one advantage that the Rohirrim and certainly the people of central Gondor do not: both have seen both Elves and Men and know what real Elves are like to a greater extent than Men do. Ents of course have seen not only them in the present, but their entire history. Hobbits, well, they do notice that Aragorn, Faramir, etc. have an 'Elvish air' about them. An equally likely possibility from a literary standpoint is that Tolkien's conception of what the Men of the West look like changed over the course of his writing of LotR. We know that Tolkien oscillated on this particular issue, just as in the early part of his conception he oscillated back and forth over whether some of the early Edain heroes were Elves or Men. I think that it can probably be interpreted several ways - although this has different implications for what would happen if, say, Beren, or Tuor, were to step out of the past into late Third Age Gondor, and what race they would be "identified" as.

*

When I referred to a "war of attrition", I was thinking along the lines of fighting using crossbow fodder: namely troops that are not difficult to produce but which you have lots of and can wear the enemy down with a meatgrinder of troops. The Rangers aren't forces like this; they're elites, and they know it. It's the Haradrim (and the Orcs) who are the crossbow-fodder. Nonetheless I agree with your description of their tactics.

I am sure that the Haradrim have officers - any army must. But who those officers are we have no idea.