the audience was/were applauding heartily in their seats//bring sth to an end/bring an end to sth
While the dancers were performing on the stage, the audience was/were applauding heartily in their seats.
-Between the be-verb of was and were, which is correct here? Is audience a singular or plural noun?
The battle finally brought the war to an end.
The battle finally brought an end to the war.
-Are the two sentences above all correct? Is there any difference between “bring something to an end” and “bring an end to something”?