increase font size Winslow’s Fort Halifax blockhouse getting new roof Work began last Thursday on the town treasure, a National Historic Landmark, and is expected to be completed by the end of May. 7 of 7 Drue Wilcox, owner of Mid-Maine Restoration, enters Fort Halifax on Friday as he and his crew replace the vintage roof of the historic Winslow fort. Michael G. Seamans/Morning Sentinel WINSLOW — The country’s oldest blockhouse is getting a needed update. Construction began Thursday on a new roof for Fort Halifax, a town treasure and National Historic Landmark. The project is expected to be completed by the end of May.