Crab and Bermuda grass

I am new to this site so forgive me if this is a repeat.  I have  an increasing amount of crabgrass and bermuda invading my fescue lawn in the front.  I have my mower set as high as possible.  What can I do as we go into fall to get rid of these invasives and get my fescue back on track.  I'm in NC where we are still dealing with drought and some water restrictions.

What kind of fescue do you have, do you know?

How cold does it get in the winter?  Does it freeze?  If so, when is the first hard frost?

I'm not sure the type of fescue, but our winters tend to be relatively mild here.  We usually don't get a really hard freeze until sometime in January.

Interesting.  You must be right on the edge of where warm season grasses can survive.  So you have an annual battle between warm season grasses and cool season grasses.

As the weather cools in your area, the fescue is gonna kick butt on the bermuda grass.  Fescue is pretty dormant during the warmest time of the year, so the bermuda moves in.  But the bermuda is going to be pretty dormant during the cool time of the year and the fescue then beats the bermuda.  My understanding is that frost will kill bermuda, but if the frost doesn't go very deep into the soil, the bermuda will probably make a comeback the following summer.

we have mostly bermuda around here. Our freeze line is about 18" deep max. Shade is the only thing that keeps it at bay. Now I know it doesn't do well up north where there are deep long freezes but around here it just comes right back. This site talks about natural ways to kill bermuda
http://www.bermuda-grass.net/getting-rid-of.html

I personally think it is the evil immortal character in a grass comic book!