Jan 20 (Reuters) - The U.S. military announced the deaths of 21 soldiers, including 13 killed on Saturday when a helicopter went down northeast of Baghdad. Five soldiers were killed by militiamen in the southern holy city of Kerbala. A U.S. soldier was killed when a roadside bomb exploded near his patrol in Baghdad on Saturday. Another soldier died on Friday after being wounded by a bomb and a marine died on Friday from wounds suffered in combat. Here is a short chronology of the deadliest days for U.S. forces since the start of the war. 2003: Nov 2 - Chinook helicopter shot down near Falluja. Sixteen U.S. troops killed and 21 others on board hurt. Nov 15 - Two Black Hawk helicopters collide under fire in Mosul, 17 soldiers killed. 2004: Jan 8 - 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. Dec 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. 2005: Jan 6 - Seven soldiers killed when a roadside bomb destroys their Bradley fighting vehicle in Baghdad. Jan 26 - U.S. Marine transport helicopter ferrying troops comes down in western desert, killing 31 aboard. June 23 - Seven troops, three of them women, killed in Falluja when a suicide car bomber detonates by a Marine truck. July 24 - Four soldiers killed when a Humvee patrol vehicle is destroyed by a roadside bomb in Baghdad, and four killed when a Bradley fighting vehicle is hit by another bomb in the city. Aug 3 - Fourteen Marines killed in a roadside bomb blast on a Marine amphibious assault vehicle near Haditha, northwest of Baghdad. A civilian interpreter was also killed. Dec 1 - Ten U.S. Marines are killed near Falluja in an insurgent bombing. Another is killed in Ramadi. 2006: Jan 5 - Eleven U.S. soldiers are killed in separate incidents the worst of which was the deaths of five in Baghdad when a roadside bomb hit their patrol. Jan 7 - Eighteen U.S. soldiers are killed, 12 of whom died when a Blackhawk helicopter came down near the town of Tal Afar near Mosul, 390 km (240 miles) north of Baghdad. Aug 27 - Twelve U.S. soldiers killed in total in Iraq mostly in Baghdad. Oct 17 - Eleven U.S. soldiers killed in separate incidents all around Iraq. Dec 6 - Ten U.S. soldiers are killed in four incidents around Iraq, some killed by roadside bombs and others in combat. 2007: Jan 20 - A U.S. military helicopter goes down northeast of Baghdad, killing all 13 people aboard, and five soldiers are killed by militiamen in Kerbala. The deaths of 22 soldiers in total were announced, two of which occurred the previous day.
