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This fort is the one Kenneth Haight mentioned when you first met him. As part of his quest, you'll have to clear out every enemy inside Fort Haight, so expect a variety of different mobs here—from your run-of-the-mill Soldiers of Godrick and Commoners to a Godrick Knight and a Pumpkin Head.
Make your way to the top of the fort and loot the chest to obtain the Dectus Medallion (Left), one-half of an essential item you'll need later on in your journey. Once you clear out the overrun fort, return to Kenneth in Mistwood Outskirts to obtain your reward and Erdsteel Dagger. You can fast travel back to Fort Haight to talk to him once more, where he promises to hold a festival in your name... though that may never come to pass.