The 4th Age mod for Battle for Middle-earth

During the reign of King Elessar, Gondor and Arnor spent years to rebuild the former glory of the Northern Realm.
The bloodlines of Edoras mingled with those of Gondor, and an even stronger bond between the two kingdoms of Men existed. Good relations were kept with Dale and the remaining Silvan Elves, and with the last of Erebor's citizens. Rhûn and Harad, the lands of the Dark men were kept under control by Elessar's might and truce, and trade flourished.

After the death of King Elessar, his son, King Eldarion took the throne. The reign of peace was kept, but there was a
darkness stirring in the east. Rumours of a new Dark Lord started to spread across the land. The forces of Gondor that were stationed in Rhûn were reïnforced, and no further sign of evil was seen for a long time, but then the sudden death of King Eldarion shocked the Kingdoms of Men. His son, a sixteen year old boy, inherited the Throne of Gondor and Arnor. King Eldaravir did what he could to maintain the truces and trade, but his reign failed. Rhûn demanded the forces of Gondor to be taken out of their lands, and Eldaravir, scared of a war, did what he was told.

This was a terrible mistake, and a few years after the Rhûnic Demand, Dale was laid under a mighty siege. A vast army of Easterlings and Variags overran the once proud city of Laketown, and took Erebor by storm. Word reached the young king Eldaravir, and fear struck into his heart. His grandfather had maintained these bonds and truces for such a long time, and now he had failed. The Easterlings were unstoppable, and they quickly swept through Northern Gondor, onto Minas Tirith, City of Kings. The Rhûn army set up camp in Northern Ithilien, and received aid from forces of Near Harad. Tirgil, son of Borogil, son of Aidunir, son of Faramir informed the White City of these advances, and then rode out to Rohan to ask for aid. The old Beacons had been dismantled long ago, and the Rangers of Ithilien rode with great haste. King Eldaravir gathered his forces and managed to put up a valiant defence, but the Easterlings numbers were too great. Nothing was heard from Rohan, and Eldaravir was forced to retreat over the White Mountains, towards Dol Amroth.

Tirgil made it to Edoras before the siege of Minas Tirith had began, but he found the capital of Rohan under siege from Haradric forces, who had gotten there by sailing to Anfalas, from there marching around the Ered Nimrais, over the River Isen. They had defeated the Gondor forces at Isengard, and now laid waste to Edoras.

The situation was terrible, Gondor was besieged at Dol Amroth, Rohan at Edoras and no word had reached Arnor yet.
Dale was defeated and the Dwarves were murdered in their mountains. The evil men had prepared this attack since the reign of Eldarion, lead by a Dark Lord by the name of Khôragan. This Black Numenorean once served under Sauron, but had escaped the onslaught at the Black Gate in the 3rd Age. After a long and exhausting battle, Rohan managed to beat back the Corsairs and Haradrim, and abandoned their ravaged capital to seek aid in Arnor. At the same time, Gondor had managed to hold the Rhûnic forces at Dol Amroth, and a large army now travelled through Anfalas and into the Enedwaith. There they headed East, through the river Isen, to Rohan. Their purpose was to strengthen and warn the Rohirrim, and to seek a shared stronghold in this sudden war. They found no refuge however, and met the forces of Rohan at the Fords of Isen. There they were ambushed by remaining Harad forces, and arrived through Anfalas every day. The battle of the Fords lasted for three weeks, before word had finally reached Fornost. The mighty army of Arnor crushed the Harad armies, and marched upon Minas Tirith in order to retake what is their.

However, the bulk of the Rhûn army has now gathered at the White City, and Khôragan, the Dark Lord himself, is with them. What will be the outcome of the final confrontation between Good and Evil? That is up to you to decide.