Next, the battle for Baghdad

The US military is on the verge of attempting something unprecedented in modern warfare: seizure of a sprawling capital without incurring heavy casualties, and without wholesale destruction of the city itself.

From World War II's battle of Berlin to the struggle for Hue in Vietnam, urban combat has proved a brutal, slogging business. That is the kind of fighting the Iraqi leadership now seems to be preparing for, as it hunkers down behind entrenched defenses and warns darkly of what will happen to US units in Baghdad's streets.

US commanders, for their part, have paused to pile up materiel for what may be a heavy blow intended to negate the need for house-by-house advance. Nor has the US given up on its preferred scenario: the collapse of Saddam Hussein's regime from within. "The US will try to make this unlike other [urban] battles," says Robert Pfaltzgraff, an expert on international security at Tufts University's Fletcher School of Law and Diplomacy. "The question is whether [it] will succeed in doing so."

At time of writing, the massed US Army and Marine units that have penetrated to within 50 miles of Baghdad had entered a phase commanders described as a "strategic pause."

Fuel, ammunition, and armored vehicles were flowing up from the south to US forces arrayed against Baghdad's outer ring of Republican Guards. In a way, the real war in Iraq seemed to be impending.

US operations to this point have involved fierce, but scattered firefights with pockets of Iraqi resistance, and Iraqi irregulars. Now, for the first time, the US-led invasion force is bumping up against a recognizable defensive front that stretches from the Tigris and Euphrates rivers near Baghdad eastward toward the frontier with Iran.

These Republican Guard troops may not have US levels of firepower, but they seem ready to fight, as shown when they repulsed a swarm of Apache attack helicopters with small-arms fire and other light weaponry.

The fact that Apaches attacked en masse - a force of 30 or so helicopters - suggests that the US may be switching the emphasis of its air campaign to close air support from the striking of strategic targets. At a briefing for reporters Tuesday in Kuwait City, US Central Command officials showed gun-camera footage of the destruction of a number of tanks and other heavy weapons, further bolstering this impression.

The US will move against Baghdad on its own schedule, said Central Command's Maj. Gen. Victor Renuart. But move it will.

"Baghdad is really the heart of the regime, and I would expect it would hold its most valuable treasures close to its heart," said General Renuart.

Not that Renuart, or any other US commander, is likely to relish that encounter. Cities are easy to turn into defensive redoubts, and the US military has little experience assaulting urban positions.

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