CHRONOLOGY-Deadliest days for U.S. troops in Iraq

(Reuters) - A suicide car bomber killed nine U.S. soldiers at a military base north of Baghdad on Monday in the deadliest single attack against American ground forces in more than a year, the military said.

Here is a short chronology of the deadliest days for U.S. forces since the start of the war.

March 23, 2003 - The third day of the war - 28 U.S. soldiers are killed, mostly in fierce fighting in southern Iraq.

-- November 2 - Chinook helicopter shot down near Falluja. Sixteen U.S. troops killed and 21 others on board hurt.

-- November 15 - Two Black Hawk helicopters collide under fire in Mosul, 17 soldiers killed.

January 8, 2004 - Black Hawk helicopter shot down near Falluja, killing all nine soldiers aboard.

-- April 29 - Car bomb near Mahmudiya, south of Baghdad, kills eight U.S. soldiers.

-- December 21 - Suicide bomber in Iraqi uniform walks into mess tent at Mosul and kills 21 people, 18 of them Americans, including 14 U.S. troops.

January 6, 2005 - Seven soldiers killed when a roadside bomb destroys their Bradley fighting vehicle in Baghdad.