Forest fires are a serious thing. The right thing to do when the fire is getting really close to your house that you may feel it would come up close to your house. Get out all the hose and sprinklers you got and set them up to spray all sides of your cottage with also making sure that the sprinklers get pretty good distance out to your yard also (so your yard can get wet also while your house is getting really wet, make sure all of your house gets a good spraying). So, get your own rain forest going. After that, make sure your cottage is like not in the forest. Such as at my house, it's got like 50feet in all directions of clear grassy yard before there's any forest. Make sure you got something like that going on also, because so many people in alaska and all over the lower 48 get their cabins and houses burned because they're structure is like surrounded by or in the forest where the structure would pretty much be right up close and personal with burning forest which then equals a structure that's going to burn down unless you make you're own rain forest. I hope you got good clearance on your cottage with it not being in the forest or close right by it. If not then still set up that sprinkler system anyway and make your own rain forest as good as you can and you should still be able to avoid your cottage burning down. And also like clean up any brush you got laying around in your yard, near your yard forest boundary, on your cottage, and get rid of it.
And yes i was a wildland firefighter, and this is what we did to keep structures from burning down when they were close to the fire boundaries. One thing forestry will not do, is put out your structure if it gets blazing, forestry does not have the equipment for that. Also, never underestimate flying sparks in the wind, in many cases it only takes a good spark to light a house on fire. Forest fires do travel fast, and they follow whichever direction the wind is going in.