Iraqi Civil War

A four sided battle broke out in a small village north of Baghdad (Sunni residents, Shia militiamen, Iraqi police(Shia,) and US forces.) Short version, 30 or 40 Shia militia rolled in for revenge attacks on the Sunnis living there, met resistance, and were later joined by official Iraqi Police in the battle.

"American soldiers also took part in the battles, but it was unclear exactly what role they played."

In the same article,

Gun battles also broke out Wednesday in the market in central Baquba, as Shiite militiamen fought with Sunni Arab insurgents, according to a shopkeeper, Hassan Abdul Fattah, 25.

The Shiite militiamen had distributed fliers in the morning warning Sunni storeowners to keep their shops closed or they would be killed, he said. Sunni Arab guerrillas then put out fliers telling the storeowners to open their shops or risk death.

The Shiite fighters, members of the Mahdi Army, rolled in at noon, and "a battle took place with grenades and mortars," Mr. Abdul Fattah said.

Open street fighting between factional elements? Wasn't that the definitional limit used in March by the administration to support the claim Iraq wasn't in a civil war?