Analysis: Intensified Combat on Streets Likely

President Bush's plan to send tens of thousands of U.S. and Iraqi reinforcements to Baghdad to jointly confront Sunni insurgents and Shiite militias is likely to touch off a more dangerous phase of the war, featuring months of fighting in the streets of the Iraqi capital, current and former military officials warned.

"The terrorists and insurgents in Iraq are without conscience, and they will make the year ahead bloody and violent," the president said last night in explaining his revised approach. "Even if our new strategy works exactly as planned, deadly acts of violence will continue -- and we must expect more Iraqi and American casualties."

The prospect of a more intense battle in the Iraqi capital could put U.S. military commanders in exactly the sort of tough urban fight that war planners strove to avoid during the spring 2003 invasion of the country. The plan to partner U.S. and Iraqi units may compel American soldiers to rely on questionable Iraqi army and police forces as never before. And while the president insisted there is no timetable associated with the troop increase, military officials said sustaining it for more than a few months would place a major new strain on U.S. forces that already are feeling burdened by an unexpectedly long and difficult war.

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