How can limping 49ers' D hope to stop Broncos?

Daily 49ers blog for NBC Bay Area website: The 49ers defense has been strong this season, but now faces the challenge of stopping Peyton Manning and the Broncos with several key players missing, including Patrick Willis. http://www.nbcbayarea.com/news/sports/Limping-but-Effective-49ers-Defense-Will-be-Challenged-279434092.html