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The Dwarven Expedition was an Explorers' League force led by Muradin Bronzebeard in order to explore the continent of Northrend and find the runeblade Frostmourne. As the expedition ventured deeper into Northrend they found more and more undead and the Undead Scourge was eventually able to separate the expedition from it's leader (who had gone on a scouting mission) and trap them. Eventually the sudden arrival of Prince Arthas and his forces would help free the expedition from the undead and with Muradin back in command the expedition would aid the 1st Legion against the undead.
Following the "deaths" of Muradin and Mal'Ganis, the prince would venture south back to Lordaeron while the Dwarven Expedition would regroup under the command of Baelgun Flamebeard. Under Baelgun's command the remaining dwarves ventured deeper into the heart of the frozen land, straight into Icecrown Glacier. When Illidan Stormrage used the Eye of Sargeras in an attempt to destroy the Frozen Throne, the tunnels of Azjol-Nerub were shaken by earthquakes which freed long-forgotten monstrosities called the Faceless Ones.
Driven out of the lower tunnels by their malicious attacks, the dwarven expedition sealed the entrance to the Inner Kingdom, guarding it to keep the Faceless Ones within. During this time the expedition also engaged in battle with the nerubians, which proved beneficial to the Scourge when they came to pass through the tunnels under the command of Prince Arthas. Fighting through the expedition Arthas would eventually encounter Baelgun, who warned the death knight that there was an ancient evil within the Inner Kingdom. But Arthas paid him little heed, and killed Baelgun and his forces.