WI O'Duffy marches on Dublin?

So (I've just learnt about this bit of history but it seems really interesting; correct me if anything's implausible) the Irish Blueshirts planned to perform a parade in Dublin in 1933, at which announcement the IRA and other (then-)left-wing organizations made plans to oppose them.

OTL De Valera bans the parade, and the Blueshirts agree to it; what if they don't? What if O'Duffy disregards De Valera's legal warnings and goes ahead with the march? Would the national army shoot on the Blueshirts if ordered to? Could the violence between the IRA/socialists, the National Guard and the army escalate into a proper coup?
 
Is this thread necromancy? If so, I'm sorry.

But anyway about the question, personally I highly doubt that it would lead to a full blown coup, most of the Irish populace at the time either didn't support facism or they were too apathetic about it to actually do anything.

That being said I could see Germany sending some kind of support to Irish fascists if they did attempt a coup.
 
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