The Realmgate Wars were the opening campaigns of the Age of Sigmar, the great offensive in which Sigmar's newly forged armies burst out of Azyr to reclaim the Mortal Realms from the grip of Chaos. After the long isolation of the Age of Chaos, the God-King unleashed his Stormcast Eternals in a lightning assault aimed at the strategic keys of all creation: the realmgates.
Because whoever controls a realmgate controls the movement of armies between the planes, these portals became the central objective of the entire war. The first hammerblow fell in Aqshy, where the Stormcast stormed the Brimstone Peninsula, and from there the fighting spread across realm after realm as Sigmar's forces sought to prise open the gates and link the scattered fronts of his reconquest.
The Realmgate Wars saw Sigmar forge alliances with other powers, the sylvaneth of Ghyran, the Fyreslayer lodges, and reluctant others besides, and they ended the age of despair by proving that Chaos could be fought and beaten. Yet victory was incomplete. The wars set the stage for everything that followed, establishing the free cities, exposing the flaws in the Reforging, and leaving the realms poised between hope and ruin when the next great catastrophe, the Necroquake, struck. They remain the founding epic of the current age.