- "We should have left the holosuite hours ago."
- "What? And let the Jerries cross the Channel? Never!"
The Battle of Britain was a notable phase of World War II; it was a protracted aerial conflict that took place in 1940 and 1941. As the prelude to an attempted full-scale amphibious invasion of Great Britain, Nazi-controlled Germany's goal was to gain supremacy over British airspace. Thanks to the tenacity of the British defenders, as well as their use of RADAR, the battle ended with Germany failing to achieve that objective, making it the regime's first major defeat. With Britain safe from invasion, the Allies were able to use it as a base from which to invade continental Europe and defeat the Nazis. (citation needed • edit)
The Battle of Britain was one of Julian Bashir and Miles O'Brien's favorite holoprograms at Quark's holosuites, taking the role of two RAF pilots in a squadron that included Clive. The pair were intent on recreating the historical setting exactly, and had their own costumes. O'Brien even abandoned his Irish accent for his role. (DS9: "Homefront")
Following the bombing of the Antwerp Conference in 2372, the two had an appointment to run the program. After playing it for a little while, they realized their hearts weren't in it and chose not to restart the program, though they did eventually return to using it regularly. They had attempted to involve Odo by inviting him to join the simulation, but the Changeling was en route to Earth and declined. (DS9: "Homefront")
The two often let the program play out for several hours – something that became a nuisance when Keiko O'Brien returned from Bajor after a six-month absence, forcing them to hurriedly clean O'Brien's quarters before she arrived. (DS9: "Accession")
When the crew returned to Deep Space 9 following Operation Return in 2374, O'Brien and Bashir's first action was to determine if the holosuites were working, and book a session in the program. (DS9: "Sacrifice of Angels")