Timeline: Important Events of the War in Iraq

March 18, 2007 — -- This week marks the fourth anniversary of the U.S. war in Iraq, and ABC News is taking another look at "Where Things Stand" in its special series of the same name.

Following is a timeline of notable events in the four years of the Iraq war.

March 17, 2003 -- President Bush gives Saddam Hussein and his sons 48 hours to leave Iraq.

March 19, 2003 -- U.S.-led invasion begins.

March 21, 2003 -- "Shock and awe" campaign begins.