The Persian Gulf War began in August 1990 when Iraq invaded Kuwait, claiming Kuwait was stealing Iraqi oil and territory. Iraq's leader Saddam Hussein expected the US and Saudi Arabia would not intervene. However, the US led a coalition of forces to defend Saudi Arabia and liberate Kuwait under Operation Desert Shield. In January 1991, the US-led coalition launched a massive air campaign called Operation Desert Storm targeting Iraqi forces and infrastructure. After weeks of aerial bombardment and missile attacks, a short ground invasion by US-led forces in February 1991 crushed the Iraqi army and liberated Kuwait within 100 hours, with minimal allied casualties. The war re-established US credibility and intervention in the region.