Off the Wall Tactics Against The Wall: What's Your Next Move? / Officer.com,
July 18, 2008

http://www.officer.com/web/online/Operations-and-Tactics/emOff-the-Wallem-Tactics/3$42372

"The expression back against the wall is often used to describe a dire situation with few options. From a tactical standpoint, having your back against a wall presents a unique set of problems. Since your mobility is severely limited, creating distance or accessing your weapons is no easy task."