GenJen54 said:
I don't necessarily agree with this. It depends upon the context. Firemen in its plural form does not need the definite article.
Firemen as a group noun does not need the article in every situation, especially when the firemen (as a group) are not specified.
You are right - as you can see, I said #2 was ok.
The reason I felt #3-5 would require an article is that those seemed to be dealing with specific fires, while #2 was a general statement about firemen and what they do. Of course, "the" could be "some," "many," or any other determiner, but I don't think the sentences works well idiomatically without anything before "firemen."
I guess it's conceivable, though, but I don't think it sounds good.
There was a fire yesterday. We called the fire department, and firemen came and put out the fire.
I would prefer that sentence with "some" (or some other determiner) before "firemen."