A cable miniseries has been pulling in unprecedented ratings, and its second night drew viewer numbers that were almost as big as the record-breaking premiere.

As we reported yesterday, History’s “Hatfields & McCoys” set a record for ad-supported cable, excluding sports, by drawing 13.9 million viewers for Monday’s first night. Now the cable channel is reporting that Tuesday’s second installment in the three-night series did almost as well, drawing 13.1 million total viewers.

Tuesday’s telecast also had 4.7 million viewers in the 18-49 demo, 5.8 million in 25-54, 2.5 million males 18-49 and 3.2 million males 25-54.

History reports: “Among total viewers, Part 1 & Part 2 now rank as the #1 and #2 entertainment telecasts of all time in ad-supported cable. In Adults 25-54 and Men 25-54, part 2 retained 100% delivery from night one.”

Part three of the program, which stars Kevin Costner and Bill Paxton, will be televised tonight.