The Fighting Temeraire tugged in the wrong direction
HMS Temeraire (Fr. "reckless") served, among other places, at the Battle of Trafalgar in 1805, in the Baltic in 1809 and at Cadiz 1810. When one of the last ships from Trafalgar, that had fought Spain, Denmark and France, was tugged to be broken up (by one of those modern steam ships no less) it symbolized the end of an era that is reflected by the setting sun. The painting couldn't have been painted in any other way.