It'd be a much more organized and planned version of what firefighters do already, including dumping retardants from the air and preparing infrastructure ahead of the fire. Mostly they set up firebreaks [1] and distribute fire fighters around the perimeter to clean up any embers that cross them. The whole process is much easier when there isn't a fire bearing down on them. In California they'd also use the DOT goat squadron [2] which is very effective at stripping any vegetation in an area. If done on a regular basis, semi-permanent firebreaks will form (like a well trodden trail) making it a really efficient process.

[1] https://en.wikipedia.org/wiki/Firebreak

[2] https://dot.ca.gov/caltrans-near-me/district-4/d4-popular-li...