BAGHDAD, Iraq, Nov. 26 - Men loyal to Moktada al-Sadr piled out of their cars at a plantation near Baghdad on a recent morning, bristling with Kalashnikov rifles and eager to exact vengeance on the Sunni Arab fighters who had butchered one of their Shiite militia brothers.

 

Forum: The Transition in Iraq

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Joao Silva for The New York Times

Mahdi militiamen in the rubble of a Nov. 12 bombing in Baghdad.

When the smoke cleared after the fight, at least 21 bodies lay scattered among the weeds, making it the deadliest militia battle in months. The black-clad Shiites swaggered away, boasting about the carnage.

Even as that battle raged on Oct. 27, Mr. Sadr's aides in Baghdad were quietly closing a deal that would signal his official debut as a kingmaker in Iraqi politics, placing his handpicked candidates on the same slate - and on equal footing - with the Shiite governing parties in the December parliamentary elections. The country's rulers had come courting him, and he had forced them to meet his terms.