Before July 10, 1940
Fighter Command prepares an integrated defense
Chain Home stations look seaward, observers track aircraft inland, and filter, group, and sector rooms turn reports into interception orders. Aircraft and pilots matter, but the Dowding System conserves scarce squadrons by sending them where raids are expected.
WHAT TO NOTICERadar is one link in a command network; information becomes useful only when people filter, distribute, and act on it.