The conflicts of the UN span a period of little over a year. During the course of this year, the UN emerged from a new clan to one of Halo Reach's current well known clan.
Timeline
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The "Reaper War" (July 2010)
The beginning of the UN's first conflict began after the first "assassination" of ShadowSniper172 and the downfall of the United Spartan Command which was led by General JB172 at the time. The people responsible were ex USC Special Forces and certain terrorist who later on divided into 2 separate but allied clans formally known as Reapers of Hell - led by Reaper and the Rouge Spartan Command - led by SandBeserker. A week later, the UN responded first against ROH with a few skirmishes and the use of wearing down there clans resolve. Assassinations and famed battles were introduced. Soon after, the UN and it's allies; including the Guardians of Sanghelios finished off the remaining decisive, major battles. When ROH was dealt with and out of the picture, the RSC was the last clan standing in the UN's path. But instead of fighting it out on the battlefield, the UN made a new suggestion. Intel revealed that the RSC had very few members and lacked much support to even carry itself as well as its own leader's vision of conflict. The UN convinced a majority of its members with factual information of the leaders current and past actions that made some think twice.
Following this, a UN member finally killed Sand off Construct for revenge of Shadows assassination; even though his clan was utterly turned against him and his ally ROH defeated. After a month the war finally came to an end, thus closing the UN's first conflict.
ODST Assault Force Conflict (August 2010)
UN troops participated in a UN peacekeeping mission on the ODST after recent attempts on destroying a clan that declared independence from the clan. The UN's goal was to establish a certain resolve or settlement between the 2 groups which resulted in conflict towards the UN after an assassination of the ODST's leader. Current battles took place; but UN political pressure eventually forced a withdraw since the independent clan was settled.
Elite Wars ( September 2010 - October 2010)
After the introduction of the UN branches, alliances, and member buildup; several elite clans attacked the UN by inviting them to "keep defenses" and demanding war. The UN responded with keeps of there own; which proved successful. Certain numbers of UN supporting clans held defenses of their own constantly inviting them in retaliation. Conflict has long ended, but threats because of "virtual races" still exist.
1st 501st War (October 2010)
After several meetings, 501st declared war for anonymous reasons which resulted in UN keep defenses. A peace treaty was issued a week later.
2nd Reaper War (October 2010)
A meeting went wrong after ROH extremists members attacked 501st and UN members which resulted in a few battles and a few defenses with allied help from LDP. Conflict soon ended.
2nd 501st War ( October 2010)
In a middle of a meeting, the 501st betrayed the UN stating threats and other repulsive things against the UN. The UN was called in for a meeting which was good at first; but the 501st shot first and soon conflict emerged. A battle was even in a middle of a meeting which resulted in a UN victory.
Peace was made soon after.
SOR Conflict (November 2010)
During a certain "peace meeting" invitation from the Spirits of Reach was given on a map, an investigation introduced that discovered a potential terrorist attack awaiting. Staged on a "meeting map" which was really just a large, poorly build keep defense destined for spawn killing. The UN studied the map and accepted there invites. Met with the expected shootings that followed, the UN took positions of the battlefield and fired back; giving a divisive victory after the end of the game with the UN in the lead. Instead of destroying the SOR; it was simply "starved out" and was left to fall.
"The TNG War" (February 12 2011 - February 13 2011)
An ally of the UN named The Next Generation, stated that they demanded Ice Demon; a UNAR member, to be kicked out of the UN immediately because he started a civil war in the TNG long ago. If the UN declined, they would leave the alliance. A meeting was held; but before hand intelligence was told of that a plot of assassination was to be set into action in the meeting. The UN made it possible to make every player invincible and unable to kill one-another. After the failed attempted killings, which indeed made a fools worth of themselves after its recorded game; the UN declared war in retaliation. The UN pulled off a keep defense in-which was dubbed as one of the most famed in history. Over 300 TNG deaths were recorded while only 27 UN members were killed. A day later, peace was agreed on and soon ended the 1 day conflict.
"War on Terror" ( April 21 2011 - May 1 2011)
After a proposed allegiance from the GGC (Guardians Grunts Clan) is turned down by the United Nations, Unleashed the leader of the GGC and the clan itself revers to terrorist actions and extremists attacks on the UN, its allies and other clans. A meeting is soon reached to discuss relations and certain future problems the GGC will now be facing. A peace agreement was supposed to be reached; but conflict aroused after a shootout. The GGC and other allied extremist networks later massacred UN members and took responsibility of further on "terror actions". One of the most important emergency meetings in UN history was called in on the reports of the GGC's actions. It was now an effort to defeat the GGC or drive them off the UN and its allies back. A global effort by the jurisdictions of several clans took part as one coalition led by the UN to counter them. The newer, more improved keep defenses were used as major battle points and "Shock and Awe" maps were installed. The UN and the coalition was positive and was supported by the people watching the conflict unfold. The GGC and the UN in the end established a peace agreement; even though the UN wanted to finish the GGC for good. Officially ending May 1st, the war on the GGC after a week of conflict, came to an end.
"UN/UUC War" (June 11 2011 - June 2* 2011) Unknown ending date
After the assassination of Shadowsniper from Avenge, the UN declared war on the United Union Clan. Revered as one of the most controversial wars in UN history, no longer was the clan facing extremists and terrorists, but a determined opponent. The first battles on the offensive were at most, unsuccessful and proved that the enemy the UN was facing would fight hard and long. The introduction of naval warfare was massively used on a grand scale to great effect against the UUC and changed general clan warfare for the major powers drastically. Many victories overcame these past defeats because of the UN vessels used, including the UNS Dauntless and the UNS Defiance. after the last battle came to a close, and a peace treaty was signed; the total amount of causalities in the entire war for both sides together included over 2000 deaths. The UN suffered over 800 while the UUF suffered over 1300 deaths. In all, it was the last major conflict in the summer of 2011.
UN/RE Conflict (November 19 2011)
After the supposed killings of UN members, the United Nations retaliated against the Roman Empire in the defense of the UN Hall, a UN meeting map mostly used for meetings; became a battle ground for the first time. The fight was mostly between long ranged rifles and DMR bullets aimed at the spawn-zone of the RE. A UN Falcon team gunned down most of the RE with tremendous damage. After the battle, a calculated amount of over 170 RE members was marked, while only a mere 27 UN members died.
UN/UCR Conflict ( December 2011 - January 10 2012)
The extremist leader WTFGrif, attacked a UN Fire Base held by a UNNG officer and other UN soldiers. Grif and some of the UCR breached many of the building, but the UN remained resistant. After the battle, the UN was on extreme alert for any further attacks and retaliation was to be underway, despite the many other clans who have been attacked by the UCR as well. The UCR's extreme leadership ended after its new leader came into power and ceased conflict seeking peace.
UN/UNICOM Conflict (February 11 2012)
UNICOM (United Ground Command) forces attacked a UN training exercise by someone inside, killing LucasHarc, the officer in charge, and a few UN members. The UN Council decided in a full vote that retaliation must be underway. The UN Council also decided that in retaliation, a new battlefield map should be used and planed. The battle would be the first UN tank vs tank battle in UN history. As planned, the UNAR would first be parachuted on the hills overlooking enemy tanks (which were 4), putting one down. 7 tanks led by Runehawk11, charged the enemy position, firing and killing the rest. It would be the last battle of the 2nd generation UN. Peace between UNICOM came into effect after the very clear view that the community would be split in two.