(CNN) -- Here's a look at what you need to know about the 1990-1991 Persian Gulf War. In response to Iraq's invasion of Kuwait in August 1990, the U.S. and other countries launched a military operation known as Operation Desert Storm.
Facts: The Allied coalition was made up of 39 countries: Afghanistan, Argentina, Australia, Bahrain, Bangladesh, Belgium, Canada, Czechoslovakia, Denmark, Egypt, France, Germany, Greece, Honduras, Hungary, Italy, Kuwait, Morocco, the Netherlands, New Zealand, Niger, Norway, Oman, Pakistan, Poland, Portugal, Qatar, Saudi Arabia, Senegal, Sierra Leone, Singapore, South Korea, Spain, Sweden, Syria, Turkey, the United Kingdom, the United Arab Emirates and the United States.
The coalition consisted of 670,000 troops from 28 countries. About 425,000 of the troops were from the U.S.
The U.S. Department of Defense has estimated the cost of the Gulf War at $61 billion.
Kuwait, Saudi Arabia and other Gulf States covered $36 billion.
Germany and Japan covered $16 billion.
More than 100,000 Iraqi soldiers were killed.
The United States had 383 fatalities.
Timeline: August 2, 1990 - Iraq invades Kuwait. Reportedly, Iraqi leader Saddam Hussein decided to invade the small, oil-rich nation in order to pay off debts incurred during Iraq's eight year war with Iran.
August 2, 1990 - The U.N. passes a resolution denouncing Iraq's invasion of Kuwait.
August 6, 1990 - The U.N. imposes sanctions on Iraq.
August 7, 1990 - U.S. President George H. W. Bush order the start of Operation Desert Shield.
August 8, 1990 - Iraq formally annexes Kuwait.
August 25, 1990 - The U.N. passes a resolution to allow enforcement of the embargo by military means.
November 29, 1990 - The U.N. authorizes use of force after January 15, 1991.
January 16-17, 1991 - Operation Desert Storm begins.
February 24, 1991 - The allied ground assault begins.
February 27, 1991 - Baghdad radio announces that Iraq will comply with United Nations resolutions.
February 27, 1991 - Kuwait is liberated.
February 28, 1991 - Coalition attacks against Iraq end.
March 14, 1991 - Kuwait's Emir returns home.
April 6, 1991 - Iraq accepts the terms of a cease-fire agreement.
April 11, 1991 - The U.N. declares an end to the war.