Apache Virtual Host redirect from subdomain to subdirectory

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http://serverfault.com – How do I redirect requests coming to http://blog.mysite.com to http://mysite.com/blog? Reading the apache docs on when not to use the rewrite mod, I tried a simple redirect e.g. Redirect http://blog.mysite.com http://mysite.com/blog But when I visit http://blog.mysite.com, it doesn't redirect me. Any suggestions? (HowTos)