The Dragon's Vengeance

The Dragon's Vengeance was a major military conflict, occurring in the Crownlands between rebels House Targaryen, and the crown House Dayne. The rebellion started in 312AB, finishing in 314AB. The war led to House Dayne's defeat, ending their dynasty, and signifying the ascension of House Targaryen as crown. House Egen also replaced House Lannister as the hand house.
== Prelude ==
Several years after the defeat of Lord Rhaegar Targaryen, or IRhaegarITargaryenI, during the War of the Dragonstar, Lord Aegon Targaryen, or Sahsook, returned to lead a reformed and new House Targaryen. His first challenge was fighting a rival clan in his family for officiality against Lord Targaryen, or Rhaxos, which he overcame convincingly. This gave an ambitious Lord Aegon control of Dragonstone, the platform were he wanted to continue his kin's legacy. 
After the aforementioned war, crown has passed from King Vorian II Dayne, or HiddenBladed, to his son, King Arthur II Dayne, or JusticeBladed. Lord Tywin Lannister, or SSWEEEEjr, continued as Hand of the King.The king was widely popular, with few enemies. 
Meanwhile on the Riverland-Vale border, one of King Arthur's few enemies, House Egen, were waging and winning a war against House Pemford for control of the King's Road. Although the crown authority was not directly involved in this conflict, Egen were a rebellious thorn in their side. 
== The Dragonstar Alliance ==
After Lord Aegon's rise, King Vorian II Dayne realised the threat posed with Dragonstone on the doorstep of King's Landing. Recognising this, he extended an alliance request, congratulating him on their victory. This alliance was accepted by Lord Aegon. This signified a proposed era of cordial relations between the two houses. However, this would all change anon.
== The Surprise Attack ==
First Siege of King's Landing (Dayne and Kingsguard vs Targaryen)
Shorty after the Dragonstar Alliance was brokered in 312AB, Lord Aegon's fleet carrying three armies arrived at the docks of King's Landing unexpectedly. King Arthur was initially confused, quickly become furious when the scale of Targaryen's betrayal became clear. Lord Aegon Targaryen planned on becoming King of the Seven Kingdoms, fulfilling Lord Rhaegar's legacy.
House Targaren's forces besieged from the docks, scaling the ladders and entering the city with ease. House Dayne's army situated itself on an inner wall, choosing to hold two elevated bottlenecks. However, this defender advantage would not aid the King's Landing Royal Garrison. Aegon's army took immediate control of the battle, pressuring Dayne's entrenched position, forcing them to fall back and give up their advantage of a bottleneck. This led to Targaryen's army putting the Daynish on the back-foot, allowing them to overwhelming the retreating force. Despite some pushes in which Dayne had brief control over the battle, the Targaryen army convincingly subdued the crown, beating them 5-2. King Aegon Targaryen was the new Protector of the Realm.
== Initial Aftermath and Daynish Reprisal ==
Battle of Hayford (Danye and Mallery vs Targaryen and Kingsguard)
After House Dayne's loss, Lord Commander Oswell Whent, or ImperialHarambe, broke his oath of fealty to the former king, pledging himself and his Kingsguard to the new Targaryen king. The Lord Commander has since been criminalised for exploiting. Furthermore, Lord Tywin pledged he would reclaim the throne for himself, which Dayne supported. 
Despite the loss of King's Landing and subsequently the majority of their armies, Dayne still had an army close to King's Landing, which linked up with House Mallery's army. This combined army planned on making King Aegon's reign short, and reclaiming the capital. King Aegon knew of the Daynish army in the local vicinity and ordered one of his own armies to intercept, in an attempt to defeat, or at the very least stall the oncoming army.
In a brief battle, the combined force of Dayne and Mallery proved too strong for the smaller Targaryen army, who were outnumbered and overwhelmed at the seat of House Hayford, Hayfrord, in the Crownlands. 
This battle signified that hope was not lost for Dayne and their allies. Furthermore, Lord Tywin Lannister's host was marching from the West. A second Siege of King's Landing was inevitable.
== The Massacre of the Lionstar ==
Second Siege of King's Landing (Targaryen and Kingsguard vs Dayne and Lannister)
With the combined House Dayne and House Lannister army besieging King's Landing from land, House Targaryen appeared to face their toughest challenge yet. Both armies where equal in size, but House Lannister and Dayne were debatably seen as the favourites due to their experience. A brutal battle would soon unfold.
Rather than playing passively as Dayne did as defenders, King Aegon took the fight to the attackers. This gave House Targaryen full control of the battle, consequently meaning that the Lannister's and Dayne's were permanently on the back-foot. This once again meant that the Targaryen Garrison overwhelmed the besiegers, allowing them to kill more whilst losing less. This approach led to a convincing 5-0 win. The dragon retained his crown.
== Aftermath ==
With House Lannister and House Dayne's defeat, no armies were left in the vicinity to King's Landing. As a result, the Dragon's Vegeance was fulfilled, with King Aegon VIII Targaryen winning the war, replacing Dayne as crown, and deposing Lannister as hand. With this latest beating, House Dayne and House Lannister backed down, signifying an end to the conflict.
However, the realm was still in a state of discord, with many enemies of the crown. This continued to include House Dayne, House Lannister, and now more significantly... their newly-appointed hand, House Egen. House Egen debatable had the strongest army in the realm, and they proved hostile. Consequently, they were replaced as hand with their current enemies, House Pemford.
A new war was ensuing. The dragon and the bird were to clash in the Strike of the Birds soon after.
Eight years later in 322AB, House Dayne and House Lannister would unite much of the realm to rebel during the United Realm War.