《欧洲告急》第七章提到在1940年9月，不列颠空战最激烈之时，丘吉尔来到位于伦敦西部郊外英国皇家空军第十一战斗大队的地下指挥中心观战，文中描述了指挥中心内部的布置：
A giant display board, the width of the room, covered one wall, keeping track of each of the Fighter Group’s twenty-five squadrons. A series of lights recorded the state of each unit—those on standby, those aloft, those that had sighted the enemy, and finally, at the top, red lights for those “Engaged”—that is, in action.
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