@Noypi
Here we go.A fine question my freind.
When King Terenas died , so did the alliance.Grand Marshal Garithos was the next in rank after King Terenas Menethil II and so he took the previlage of leading since the silver Hand was broken and Uther dead.Tirion Fordring ,the next to Uther for the command of the silver hand has been banished 5 years ago since an incident happened(this is another story which i may tell you later of just read the novel "Of Blood and Honor").So its up to Othman Garithos and Saidan Darthohan (A veteran paladin of the 2nd war and propably the next leaded of the slow dieing Silver Hand) to lead the last alliance soldier to stand their ground and defend what's left of Lordaeron.
*takes a breadth*
Saidan Darthohan was the Commander of Stratholme ( the same Stratholme that Arthas purged during the Reing of Chaos Human campaign Chapter 6) and he wasn't there ,the reason is unknown to me cause the lore doesn't mention it.Gathering up as much "patriots" as he could find he forms up the Scarlet Crusade along with Fordring's son which his name i may miss spel and for that i wont type it and Alexandros Morgain the legendary Ashbringer and Champion of the Alliance.Their Bases are Stratholme , Tyr's Hand and Scarlet Monastery former Tirisfall Monastery.
Meanwhile Lord Maxwell Tyrosos forms up the Argend Dawn,and "organisation" with the same goal like the Scarlet crusade.The Argent dawn will play small roles for now...
When Sylvanas takes the capital city and kills Garithos ,Varimarthas hasn't killed Balnazar at all but a duplicate image of him.And so our little freind Balnazar escapes and corrupts the Scarlet Crusade by killing Saidan Dathrohan and possesing his body.Then when the corruption begins to show its self many members leave and join the Argent Dawn.Then Kel'thuzad starts a bargain with Balnazar in order to take the Ashbringer the Sword of Alexandros Morgain.Striking a deal with Balnazzar, who had covertly taken control of the Order by possessing Dathrohan and wished to use it against the Lich King, the two planned to kill him. To do so, Balnazzar corrupted Mograine's son Renault and had him lead his father into a trap. Renault led his father and High Inquisitor Fairbanks to Stratholme where an army of undead waited for them. Renault fled and Fairbanks, being the first to fall, was trapped under the pile of undead corpses. Mograine stood alone against the undead, yet managed to destroy all sent at him. In fatigue, Alexandros dropped his blade. Renault returned and killed Mograine with his own sword, corrupting the Ashbringer. Unable to use the blade, Renault left it with his father's corpse.
And thats how the Scarlet Crusade's Story ends.With the Death of Fordring's Son the Crusade becomes Hostile to all human and inhuman beings.
*takes a breath*
Now there is a major battle at the Plaguelands that took place after the previus events.This is the Battle of the Light's Hope Chapel.Here is what happened:
Highlord Darion Mograine, wielding the [Corrupted Ashbringer], leads Orbaz Bloodbane, Koltira Deathweaver, Thassarian and a force of 10,000 Scourge against 300 Defenders of the Light and the Argent Dawn leadership located at Light's Hope.
The Scourge forces pound hard and take out an entire third of the Argent Dawn defense, but Mograine starts having problems attacking further defenders with the arrival of Tirion Fordring. Fordring's Light-given powers overpower and defeat Mograine, as well as immediately kill the Scourge forces in the immediate area, causing Orbaz Bloodbane to flee. Darion orders the remaining death knight forces to stand down while Fordring berates him for what he has done.
Suddenly The Ashbringer, Alexandros Mograine, appears. Darion, shocked at his father's arrival, becomes a shade of his past and relives the conversation he had with Alexandros when he decided to join the war against the Lich King. As Alexandros says that one day Darion will wield the Ashbringer, the Lich King appears and banishes Alexandros to the abyss.
Darion comes back to himself, realizing the depths of his betrayal and attacks the Lich King who swats him away, knocking him out. Fordring, also surprised at the turn of events, comes forward in preparation to attack the Lich King. However, Fordring revealing himself is exactly what the Lich King had planned as he incapacitates Fordring in an attempt to kill him. Lord Maxwell Tyrosus calls in the order to attack and the remaining Defenders of the Light all charge in, followed shortly by the Argent Dawn leadership, all of whom are batted away and stunned in the process.
As the Lich King taunts his nigh-inevitable victory, releasing the spell on Fordring, Darion regains consciousness and throws the Corrupted Ashbringer to Fordring, then collapses again. Fordring realises he is holding a cleansed Ashbringer and charges toward the Lich King. Aware that even he stands little chance against the Ashbringer near the Chapel, the Lich King retreats, promising that the next time he meets Fordring, it will not be on holy ground.
The battle concluded, Fordring walks over to where Darion is lying and brings him back to consciousness. He laments the loss of souls on both sides of the conflict, and calls for a merger of the Argent Dawn and the Order of the Silver Hand. The new Argent Crusade will use their combined force to attack the Lich King, in tandem with the Knights of the Ebon Blade, freed death knights under Darion's leadership.
After that the Lich King Arthas strikes at Ogrimmar and Stormwind and both attacks fail.Then with the combination of the Alliance and the Horde's troops Tirion and Darion lead on the charge against the Lich King at the Frozen Throne with the forces of men,elfs,orcs,dwarfs,gnomes,forshaken,trolls and taurens against him.
The final battle is between Tirion and Arthas.Tirion smashes Frostmourne with the Ashebringer and kills arthas letting his spirit and thos who had killed to go free(including Terenas,Uther,Muradin and others who had murdered).Thus the undead are no more exept the Forshaken.
*takes a breath*
Now at theremore...
Since the breaking of the world, Theramore's role as a military base of operations has been renewed. Thrall, Jaina's staunchest ally within the Horde, has stepped down as Warchief, leaving the brash war-monger Garrosh Hellscream in charge. Soon after, with Garrosh's invasion of Ashenvale Forest, Theramore was forced to abandon their unofficial truce with the Horde. No longer a human sanctuary and peaceful trading port, it has become the launching point of every incursion into the Barrens. This has, in a fortunate turn of events, been made easier by the fracturing of the land itself. With the Southern Barrens nearly completely cut off from any aid from Orgrimmar, the battle for control of the strategic grasslands is already underway. To aid in this effort, the Alliance has begun construction of a massive highway from Theramore through Dustwallow Marsh and into the Southern Barrens, thus allowing the Alliance to more quickly move supplies and troops deep into Horde territory. Ironically, the same Cataclysm that helped their invasion into the Southern Barrens has greatly hampered their ultimate goal of joining with their Night Elf allies in the north. This of course threatens their very survival, and it is reflected in their increasingly desperate tactics. They have destroyed Camp Taurajo, and have fortified Northwatch Hold as a second stronghold against what will no doubt be a merciless retaliation by the Horde.
It is revealed in the novel Tides of War, that the city is destroyed by a manabomb created by the blood elves using the Focusing Iris and dropped from a goblin zepplin. The blast kills most of the Alliance defenders, including Rhonin, the 7th Legion, and many of its commanders. Jaina's gnome apprentice, Kinndy, is also killed in the blast.
Jaina's eyes and hair were mostly turned white due to the blast and the violence brought on by it. The only known survivors are Vereesa Windrunner, Shandris Feathermoon, Jaina Proudmoore, and Kalecgos of the Blue Dragonflight. The ruins of Theramore are described in the novel to have a purple-pink hue around it, having been caused by the manabomb. This particular manabomb is described as the biggest in Azeroth's history.
Thus the story of Theramore is over too.Then follows the Siege of Ogrimar and Hellscreams death.
Ps:i hope you will enjoy reading this cause it took me 45 mints to write it
Thanks again for asking.