Question: What conflict brought the countries of Chile and Argentina to the brink of War, where the first planned military invasion was halted without incident?
Context: Little Joe 1A (LJ-1A) was an unmanned rocket launched as part of NASA's Mercury program on November 4, 1959.  This flight, a repeat of the Little Joe 1 (LJ-1) launch, was to test a launch abort under high aerodynamic load conditions.  After lift-off, the pressure sensing system was to indicate when the correct abort dynamic pressure was reached.  This should have happened about thirty seconds after launch.  A signal was sent to the explosive bolts to separate the spacecraft from the launch vehicle.  Up to this point, everything was going as planned.  The impulse was also intended to ignite the escape motor.  The motor was ignited, but it took a number of seconds to build up thrust, and thus the abort maneuver was not accomplished at the desired dynamic pressure.  Because of this, a repeat of the test was planned.  Other events from launch through recovery occurred without incident.  An altitude of 9 statute miles (14.5 km) and a range of 11.5 statute miles (18.5 km) were obtained, and a speed of 2,021.6 miles per hour (3,254 km/h) was reached.  Flight time 8 minutes 11 seconds.  Payload 1,007 kg. The Denver was a NORAD geographic area designated during the Cold War in the Zone of Interior (ZI) for both air defense and air traffic control, as well as the name of the planned military unit for conducting radar surveillance and fighter-interceptor operations in the sector area.  The Denver ADS spanned the entire state of Colorado, nearly all of Utah, most of Wyoming and western Nebraska, and small parts of Kansas, Oklahoma, New Mexico, Arizona, and Nevada.  Targets in the sector included the military/industrial facilities and urban civilian populations of the metropolitan areas at Salt Lake City, Cheyenne, Denver, and Colorado Springs—the Colorado underground ICBM construction began in tbd.  (Omaha and Wichita military/industrial complexes were in the Sioux City sector). The Bluffton University bus crash was an automobile crash that occurred during the early morning hours of March 2, 2007, on Interstate 75 in Atlanta, Georgia.  A chartered motorcoach was carrying 33 members of the Bluffton University baseball team from Bluffton, Ohio, on their way to a tournament game during spring break in Sarasota, Florida.  The group planned to travel without an overnight stop on the approximately 900-mile, 18-hour trip.  The trip went without incident from Bluffton south to a motel in Adairsville, Georgia, at which time a relief driver began operating the bus for the second half of the trip. Operación Soberanía (Operation Sovereignty) was a planned Argentine military invasion of Chile started on 22 December 1978 due to the Beagle conflict dispute.  The invasion was halted after a few hours and Argentine forces retreated from the conflict zone without a fight.  Whether the Argentine infantry actually crossed the border into Chile has not been established.  Argentine sources insist that they crossed the border. The First Egyptian-Ottoman War, First Turco-Egyptian War or First Syrian War (1831–1833) was a military conflict brought about by Muhammad Ali Pasha's demand to the Ottoman Empire for control of Greater Syria, as reward for his assistance in Crete against Greece.  As a result, Muhammad Ali's forces temporarily gained control of Syria, and advanced as far north as Adana. United Nations Security Council Resolution 228, adopted on November 25, 1966, after hearing statements from representatives of Jordan and Israel as well as a report from the Secretary-General U Thant concerning the military action, the Council observed that this incident constituted a large-scale and carefully planned military action against Jordanian territory by the armed forces of Israel. The Beagle conflict was a border dispute between Chile and Argentina over the possession of Picton, Lennox and Nueva islands and the scope of the maritime jurisdiction associated with those islands that brought the countries to the brink of war in 1978. The Mechelen Incident of 10 January 1940, also known as the Mechelen Affair, was an event which occurred in Belgium during the Phoney War in the first stages of World War II.  A German aircraft with an officer on board carrying the plans for "Fall Gelb" (Case Yellow), the German attack on the Low Countries, crash-landed in neutral Belgium near Vucht in the modern-day municipality of Maasmechelen within the Province of Limburg.  This prompted an immediate crisis in the Low Countries and amidst the French and British authorities, whom the Belgians notified of their discovery; however the crisis abated relatively quickly once the dates mentioned in the plans passed without incident.  It has been argued that the incident led to a major change in the German attack plan, but this hypothesis has also been disputed. On Sunday, 20 July 2014, a pro-Palestinian protest against the Israeli ground invasion of Gaza degenerated into an antisemitic riot in Sarcelles, France.  An illegal demonstration gathered about 500 persons (the police and organisers having similar figures), without incident, but the riots broke out quickly after the dispersion of the demonstration, starting with 50 protesters provoking the police and eventually involving up 300 people according to the report of the riot police.  Jewish-owned businesses and non-Jewish owned businesses were attacked and looted by local youths armed with metal bars and wooden clubs.  Members of La Ligue de défense juive (LDJ, Jewish Defense League) were present in Sarcelles, and attempted to defend a synagogue by forming a line in front of it and holding motor-cycle helmets as weapons.  Palestinian groups accused the League of provoking the attack by taunting demonstrators and throwing projectiles. The Battle of Fishguard was a military invasion of Great Britain by Revolutionary France during the War of the First Coalition.  The brief campaign, on 22–24 February 1797, is the most recent landing on British soil by a hostile foreign force, and thus is often referred to as the "last invasion of Britain".  The French General Lazare Hoche had devised a three-pronged attack on Britain in support of the Society of United Irishmen.  Two forces would land in Britain as a diversionary effort, while the main body would land in Ireland.  Adverse weather and ill-discipline halted two of the forces but the third, aimed at landing in Wales and marching on Bristol, went ahead.
Answer: The Beagle conflict was a border dispute between Chile and Argentina