|casual1=Moderate<ref>Depending of the skill of the player and the difficulty the amount of deaths, however, they must be less than the enemy in order to win.</ref>
+
|casual1=Moderate<ref>Depending of the skill of the player and the difficulty the number of deaths, however, they must be less than the enemy in order to win.</ref>
|casual2=Heavy<ref>More enemy units than owned units have to die in order to win.</ref>
|casual2=Heavy<ref>More enemy units than owned units have to die in order to win.</ref>
Countdown to Extinction is the chapter five (5) of the demo campaign and the chapter three (3) of the custom campaign, Exodus of the Horde. During the battle, the Darkspear trolls and the Horde managed to escape the Sea Witch and her murlocs.
Sea Witch: "Sail on, land-dwellers. Flee! The Dark Tide is coming to swallow you all, and once it begins, there will be nowhere to hide!"
Thrall: "I don't know exactly what the witch was talking about, but I do know that our destiny lies elsewhere. For now, we set sail for Kalimdor. That is where our future will unfold."
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As Thrall escapes, he is chased by the Sea Witch and her murloc warriors. The repairs to his storm-damaged ships are not done and he must rally his forces to hold the line and protect the ships until they are repaired. Unfortunately, the volcano on the island is also erupting and the whole island appears to to be sinking into the sea. Some imprisoned trolls around the island are rescued to provide reinforcements against the Sea Witch and her warriors.
The ships are repaired and Thrall's forces continue on to Kalimdor, beginning the Invasion of Kalimdor.