Gilneas is a human nation ruled by Lord Genn Greymane. Gilneas is located south of Silverpine Forest (Lordaeron Continent). It is mostly a peninsula. Tall cliffs surround Gilneas on the west, south and east.
During the Second War, the Horde once more invaded Alliance territories. The first Horde Campaign in Warcraft II: Tides of Darkness was a invasion of the Blackrock Clan ordered by Warchief Orgrim Doomhammer to Zul’Dare—an island directly south of Gilneas, and property of Gilneas. ( Read the Zul’Dare Campaign ).
Admiral Daelin Proudmoore and his Naval Fleet were able to drive off the Blackrock clan. However, Lord Genn Greymane felt threatened by the orcish attacks of Gilneas’ territory and it was then that he agreed to join the Alliance of Lordaeron.
However, this was out of convenience to be protected by the Alliance. Gilneas did not provide substantial support to the Alliance during the Second War, if any.
Mysteriously, Lord Genn Greymane presented Lord Prestor of Alterac to King Terenas and the Alliance at the Capital of Lordaeron. Lord Prestor was supposedly sheltered by Gilneas when Prestor fled from Alterac.
Lord Genn Greymane proposed that Lord Prestor—heir to the crown—should be placed as new King of Alterac.
In reality, the human Lord Prestor was only a disguise. His true identity was Deathwing – the Dragon Aspect of Earth
Using his magical powers over Earth and its creatures, Deathwing charmed the Kings of the Alliance Nations. They immediately felt prompted to admire the noble Human dressed in shiny black armor. King Terenas, charmed by Deathwing’s magic, supported that Lord Prestor be crowned King of Alterac. Lord Prestor convinced each leader with empty promises, offering their heart’s desires. Lord Genn Greymane of Gilneas wished riches and resources of Alterac to prosper as a nation, while Admiral Daelin Proudmoore wished to extend his territory in the Great Sea. Each monarch pleased to have Lord Prestor lead the fallen kingdom for their own advantages.
King Terenas even envisioned his own daughter Calia to marry Lord Prestor, which in turn would open diplomatic ties with Alterac to extend Lordaeron Kingdom’s territories. Hillsbrad Foothills was highly sought by Arathi, Lordaeron, and Gilneas as territory for grabs.
With the fall of the Dragonmaw Clan, and the liberation of the red dragon Queen Alexstrasza, Deathwing was defeated and escaped. Grim Batol (eastern Wetlands) was taken by the Hill Dwarves and secured. It has currently become the new lair of the Red dragonflight.
Fans believe that Deathwing died. However, the last page of Warcraft: Day of the Dragon says:
With Lord Prestor disappeared, the charm blurring their thoughts vanished. None of the Alliance monarches wanted Lord Prestor as King of Alterac. He was not even been seen to tell him so. Prestor completely disappeared.
The Horde was later defeated. Some orcs ran back through the Dark Portal for their lives, while some Blackrock Clan orcs, the Burning Blade, Black Tooth Grin, Shattered Hand, Dragonmaw and Bleeding Hollow Clans were captured by the Alliance and distributed into seven Internment Camps. The only Hordish clan uncaptured remained the Warsong Clan, and the long-exiled Frostwolf Clan—not counting the few scattered Stormreaver survivors in the Broken Isles and Ogre clans.
With the costs of maintenance of the Internment Camps rising, King Terenas decreeted that each nation of the Alliance had to pay a special tax. Lord Genn Greymane rose up in rage proclaiming that the Alliance should kill the Orcs instead of placing them in internment camps. With that said, Genn Greymane told King Terenas the following:
With that said, Lord Genn Greymane left the Alliance and ordered his nation to build a massive wall to block access to Gilneas: The Greymane Wall. The Greymane Wall was built somewhere around year 16-20 after the Dark Portal was opened for first time. An exact date is unknown, therefore this is unofficial.
Analyzing the Warcraft timeline provided by Warcraft: Lands of Conflict—and the Brann Bronzebeard’s quote: “Ten years ago, Gilneas was a cold, rainy place and
Chronologically, according to the Wow RPG Corebook:
Many fans wrongly think that the Greymane Wall was built to protect Gilneas from the Undead Scourge and the Plague. In reality, the Greymane Wall was built after the Second War, 10 years ago—according to Prospector Brann Bronzebeard.
( NOTE: You may read further details and description of Gilneas in Warcraft RPG: Lands of Conflict – page 96-97