> Are they just trying to prevent the spread and wait till the fire kills itself?
Basically this whenever possible, often if it's not near a populated area they won't even try to limit the spread, they put themselves out eventually with the right conditions (wind, rain, geography). Near populated areas they do what they can, mostly controlled burns and having fire breaks that allow them to effectively concentrate resources (firetrucks, water bombers) where they can actually be useful, a firetruck can be effective where there's a firebreak but without one it would be suicide to be there.
Basically this whenever possible, often if it's not near a populated area they won't even try to limit the spread, they put themselves out eventually with the right conditions (wind, rain, geography). Near populated areas they do what they can, mostly controlled burns and having fire breaks that allow them to effectively concentrate resources (firetrucks, water bombers) where they can actually be useful, a firetruck can be effective where there's a firebreak but without one it would be suicide to be there.