Iraq War: More than 10,000 U.S. troops and a small number of Iraqi army units participate in a siege on the insurgent stronghold of Fallujah.

The Iraq War, also referred to as the Second Gulf War, was a prolonged conflict in Iraq from 2003 to 2011. It began with the invasion by a United States-led coalition, which resulted in the overthrow of the Ba'athist government of Saddam Hussein. The conflict persisted as an insurgency that arose against coalition forces and the newly established Iraqi government. US forces were officially withdrawn in 2011. In 2014, the US became re-engaged in Iraq, leading a new coalition under Combined Joint Task Force – Operation Inherent Resolve, as the conflict evolved into the ongoing Islamic State insurgency.

Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to the south, Turkey to the north, Iran to the east, the Persian Gulf and Kuwait to the southeast, Jordan to the southwest, and Syria to the west. The country covers an area of 438,317 square kilometres (169,235 sq mi) and has a population of over 46 million, making it the 58th largest country by area and the 31st most populous in the world. Baghdad, home to over 8 million people, is the capital city and the largest in the country.

Fallujah is a city in Al Anbar Governorate, Iraq. Situated on the Euphrates River, it is located roughly 69 kilometres (43 mi) to the west of the capital city of Baghdad and 50 kilometres (31 mi) from the neighboring city of Ramadi. The city is located in the region defined as Sunni Triangle by the United States, as the majority of its residents are Sunni Arabs. In 1947, Fallujah was a small town with a relatively small population but had grown to a population of about 250,900 people by 2018.