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Questions & Answers about Þau stöðvuðu bardagann.
Is þau singular or plural here?
Here, þau is plural.
You can tell from the verb stöðvuðu, which is the 3rd person plural past form of stöðva.
A useful extra note: in modern Icelandic, þau can sometimes be used as a singular gender-neutral pronoun, but that is not what is happening in this sentence, because the verb is clearly plural.
What case is þau in, and why?
Þau is in the nominative case because it is the subject of the sentence — the ones doing the action.
In Þau stöðvuðu bardagann, þau are the ones who stopped something, so nominative is the expected case.
Why is it þau and not þeir or þær?