Chain Home
The radar fence that fed the filter rooms. A named operational object of Battle of Britain (10 July-31 October 1940 (official RAF dates)).
Fighter Command (11/12/10 Groups), Observer Corps, radar chain, versus Luftflotten 2 and 3. Allied exile squadrons in RAF marks.
Bomber Command's raids on invasion ports are a third force often cut from "the Few" sentence.
Systems
Dowding system
Radar, telephone, sector control -- the real machine.
Hugh Dowding's command
Built the system, won the battle, lost the personnel fight. A late-honoured British type.
Keith Park's command
The New Zealander who ran the southeast fight; also sidelined, later a hero in print.
Hardest day
1940-08-18: A later named peak of losses on both sides.
Daylight air superiority denied
Sea Lion's sky condition unmet.
Meters
Geographic / demographic scale
32
Peak intensity
68
How long it defined a period
20
Tech or method shift
62
Borders, regimes, law, alliances
70
Film, school, ritual density
78
Hotspots
Channel
Jul 1940: Convoy fights; the learning month. Named as historical geography of Battle of Britain, not as a targeting list.
Airfields
Aug 1940: 11 Group under strain. Named as historical geography of Battle of Britain, not as a targeting list.
London
Sep 1940: Daylight capital; then night. Named as historical geography of Battle of Britain, not as a targeting list.
Official close
Oct 1940: Fighter Command still fighting; dating ends. Named as historical geography of Battle of Britain, not as a targeting list.
Memory
After: Films, flypasts, Polish plaques. Named as historical geography of Battle of Britain, not as a targeting list.
Materials
Chronology (10 July-31 October 1940 (official RAF dates))
Battle of Britain is bounded as 10 July-31 October 1940 (official RAF dates). 1940-06 opens the usual narrative (France falls); 1969 closes it (Film Battle of Britain).
Theatre: English Channel, southeast England, London appr.
Place is evidence. English Channel, southeast England, London approaches is where Battle of Britain happened -- a map for readers, not a guide for repeating it.
Human-cost band
about 500-1,000 RAF aircrew dead in the battle period; Luftwaffe losses higher; civilian Blitz deaths are a linked but wider ledger Keep the figure as a range. Spectacle integers are not a census.
11 Group
Park's southeast group under the main attack. A material of the Battle of Britain vocabulary, dated to 10 July-31 October 1940 (official RAF dates).
1940 organisation, not a modern air-defence ORBAT or an interception manual.
Training units and repair yards were the depth.