It was supposed to last five days, maybe five weeks, and certainly no more than five months. Instead, the war in Iraq is now entering its sixth year. And all will be won - or lost - in its capital, Baghdad. Today, it is the scene of almost unimaginable destruction and chaos. The Americans have recently committed 20,000 more troops to the city’s defense in a last ditch effort to stave off civil war. BATTLE FOR BAGHDAD takes an in-depth look at what went wrong in Iraq - and at what the future holds - through the eyes of John Burns, the two-time Pulitzer Prize-winning writer for the New York Times.