Question: Which battle lasted longer, the Battle of Guam, or the Battle of Saipan?
Context: The Battle of Saipan was a battle of the Pacific campaign of World War II, fought on the island of Saipan in the Mariana Islands from 15 June to 9 July 1944.  The Allied invasion fleet embarking the expeditionary forces left Pearl Harbor on 5 June 1944, the day before Operation Overlord in Europe was launched.  The U.S. 2nd Marine Division, 4th Marine Division, and the Army's 27th Infantry Division, commanded by Lieutenant General Holland Smith, defeated the 43rd Infantry Division of the Imperial Japanese Army, commanded by Lieutenant General Yoshitsugu Saito. The Zhou dynasty ( ) was a Chinese dynasty that followed the Shang dynasty and preceded the Qin dynasty.  The Zhou dynasty lasted longer than any other dynasty in Chinese history.  The military control of China by the royal house, surnamed Ji (), lasted initially from 1046 until 771 BC for a period known as the Western Zhou and the political sphere of influence it created continued well into Eastern Zhou for another 500 years. The specific site of the battle itself is disputed by historians, but most consider it to have occurred somewhere near modern-day Kaalaa Aamb and Sanauli Road.  The battle lasted for several days and involved over 125,000 troops.  Protracted skirmishes occurred, with losses and gains on both sides.  The forces led by Ahmad Shah Durrani came out victorious after destroying several Maratha flanks.  The extent of the losses on both sides is heavily disputed by historians, but it is believed that between 60,000–70,000 were killed in fighting, while the numbers of injured and prisoners taken vary considerably.  According to the single best eyewitness chronicle—the bakhar by Shuja-ud-Daulah's Diwan Kashi Raj—about 40,000 Maratha prisoners were slaughtered in cold blood the day after the battle.  Grant Duff includes an interview of a survivor of these massacres in his "History of the Marathas" and generally corroborates this number.  Shejwalkar, whose monograph "Panipat 1761" is often regarded as the single best secondary source on the battle, says that "not less than 100,000 Marathas (soldiers and non-combatants) perished during and after the battle." The Battle of St Matthew's or Battle of Short Strand was a gun battle that took place on the night of 27–28 June 1970 in Belfast, Northern Ireland.  It was fought between the Provisional Irish Republican Army (IRA) and Ulster loyalists in the area around St Matthew's Roman Catholic church.  This lies at the edge of the Short Strand, a Catholic enclave in a mainly-Protestant part of the city.  Violence had erupted there, and in other parts of Belfast, following marches by the Orange Order.  The battle lasted about five hours and ended at dawn when loyalists withdrew.  The British Army and police were deployed nearby but did not intervene.  Three people were killed and at least 26 wounded in the fighting, while another three were killed in north Belfast. Battle of Saipan order of battle is a description of the major ground combat formations that participated in the Battle of Saipan during World War II.  The battle took place between 15 June and 9 July 1944. Battle of Määritsa (Estonian: "Määritsa lahing" ,also known as Battle of Osula, "Osula lahing" ) was a battle held in Osula village, at that time in Võru County, Estonian SSR, Soviet Union.  It began on the night of 31 March 1946, involving members of the Forest Brothers and Soviet occupation forces.  Seven Estonian fighters based at the Hindrik farmhouse were besieged by up to 300 Soviet soldiers.  The battle lasted about seven hours before the farmhouse caught fire and the Soviets demanded that the rebels surrender.  Only two fighters managed to escape alive from the farmhouse, but were subsequently killed in battle with the besiegers. The Second Battle of Guam (21 July – 10 August 1944) was the American recapture of the Japanese-held island of Guam, a U.S. territory in the Mariana Islands captured by the Japanese from the U.S. in the 1941 First Battle of Guam during the Pacific campaign of World War II. This is a list of military engagements of World War II encompassing land, naval, and air engagements as well as campaigns, operations, defensive lines and sieges.  Campaigns generally refer to broader strategic operations conducted over a large bit of territory and over a long period.  Battles generally refer to short periods of intense combat localised to a specific area and over a specific period.  However, use of the terms in naming such events is not consistent.  For example, the Battle of the Atlantic was more or less an entire theatre of war, and the so-called battle lasted for the duration of the entire war.  Another misnomer is the Battle of Britain, which by all rights should be considered a campaign, not a mere battle. The Battle of Fort Dearborn was an engagement between United States troops and Potawatomi Native Americans that occurred on August 15, 1812, near Fort Dearborn in what is now Chicago, Illinois, but was then part of the Illinois Territory.  The battle, which occurred during the War of 1812, followed the evacuation of the fort as ordered by William Hull, commander of the United States Army of the Northwest.  The battle lasted about 15 minutes and resulted in a complete victory for the Native Americans.  Fort Dearborn was burned down and those soldiers and settlers who survived were taken captive.  Some were later ransomed.  After the battle, however, settlers continued to seek to enter the area, the fort was rebuilt in 1816, and settlers and the government were now convinced that all Indians had to be removed from the territory, far away from the settlement. The Battle of Puruarán was a battle of the War of Mexican Independence that occurred on 5 January 1814 in the area around , Michoacán.  The battle was fought between the royalist forces loyal to the Spanish crown and the Mexican rebels fighting for independence from the Spanish Empire.  The Mexican insurgents were commanded by Mariano Matamoros y Guridi and the Spanish by Agustín Cosme Damián de Iturbide y Arámburu who would later go on to become the Mexican emperor, and by Ciriaco del Llano.  The battle lasted approximately one hour and resulted in a victory for the Spanish Royalists.
Answer: The Battle of Saipan