However, they do not strictly follow history. The first six books quickly move through twelve years of the Napoleonic Wars, as established by frequent reference to historical events, with "The Fortune of War" ending on 1 June 1813 with the battle between HMS "Shannon" and USS "Chesapeake". The series then enters a kind of fantasy-time in which it takes another dozen novels to progress to November 1813. Much of this period is spent at sea, with little or no connection to real-world years, and the events of the novels take up substantially more time than the few months 'available'. External historical reference returns with "The Yellow Admiral", the 18th book in the series. Towards the beginning of this novel, it is stated that the British army under the Duke of Wellington has entered France from Spain, which occurred in November 1813. Time is then paused again for a few chapters, as a narrative apparently lasting several months ensues before a specific arrival at Christmas 1813. Thereafter, the book and the next in the series ("The Hundred Days") move swiftly through the historical events of Napoleon's disastrous invasion of Russia and his defeat in the War of the Sixth Coalition, his exile and escape from Elba, and his final campaign and defeat in June 1815. The last completed book in the series, "Blue at the Mizzen", is the only volume which is set entirely after the conclusion of the Napoleonic Wars.