Caesar Partisans.... though you may have to change some of the weapons

They tend to be ones or twos in sets including RB Boxer Civilian volunteers, Pegasus Germans in Berlin 1945, Zvezda Soviet militia, Caesar Underground resisters(sic) and Strelets partisans to add to the others mentioned. CP models also do CP and TQD branded 20mm white metal partisans, civilians etc. I don't know how difficult it would be to obtain the plastic sets as they linger for years or vanish overnight. Actually I wouldn't mind some unarmed gawpers of the 1920s/30s as most civil wars consist of civilians who come out to see what the fuss is about or cower in doorways or try to get food and water. Most unarmed civilian model figures are intended for model railways so the poses tend to be geared to waiting for the train or generally very static and devoid of peril.
BTW the IRA in Dublin in 1916 were uniformed. The later flying columns had bandoliers and Sam Browne belts, gabardine macs/trench coats, gaiters and some had the "Australian" (actually based on the Boers) hat. Most commandants had some of the original uniform or looked a bit more formal. So not a uniform by any measure but the appearance of a battalion (especially rural ones) had some uniformity.

David

Hi Michael

I guess from your name the Anglo-Irish War is probably a conflict close to your heart. Yes I do appreciate that there was a distinctive look to the men of the hillsides and a distinctive IRA uniform in appropriate green. My suggestion wouldn't be for the purists I agree but to give a flavour of interbellum guerillas. Of course if Strelets want to do a set complete with Michael Collins in the uniform of the Republic and Mr.De Valera, then they would be very welcome to do so from my point of view.

The Troubles would not be complete without British Black and Tans and Irish Police Auxiliaries.