On August 16, 1856, some fifty Free State men under Captain Samuel Walker attacked Ft. Titus. After a brief battle, Ft. Titus and its thirty-four defenders, including Colonel Henry Titus, surrendered. Also surrendered were 400 muskets, a large number of knives, 13 horses, several wagons, a large stock of household provisions, farm equipment and $10,000 in gold and bank drafts.
http://www.lecomptonkansas.com/fort-titus/
The fort was actually a cabin near the town of Lecompton, in Douglas County. There is more information at the link.
I have a post from “Bleeding Kansas” for tomorrow, which includes a paragraph on the attack on Titus’s “fort.” It includes a drawing of men fighting in front of a cabin, but doesn’t mention that the cabin is the fort.