One of the things I love about the official history of the RFC and RAF in the First World War is all the maps -- multi-panel fold-out jobs showing where bombs fell in London during the Gotha raids, or the Allied front in Macedonia. That's not to mention the accompanying slip-cases stuffed full of more maps of the paths taken by Zeppelin raiders and the like. I could pore over these for hours ...
Here are a couple of the maps (or parts thereof) showing two different kinds of barrages associated with the air defence of Britain.
The first one is entitled 'Aeroplane barrage line. December, 1916.' It's too big to show effectively, so I've just reproduced a portion showing the coast of Lincolnshire and Yorkshire. The red squares show home defence squadron HQs: 33 Squadron at Gainsborough and 76 Squadron at Ripon. The red triangles are flight stations, the red stars flight stations with searchlights, the blue circles are searchlight stations under squadron control ('aeroplane lights') and the black circles are warning control centres (Hull).
As I've discussed before, artillery barrages weren't the only kinds of barrages. Originally they seem to have just been barriers or walls of some kind (barrage originally referred to a dam). Here the barrage is composed of aeroplanes and searchlights, a wall erected to hopefully bar Zeppelins coming in over the North Sea from reaching the industrial cities behind the line. And it does look like a barrier: on the full map it stretches from Suttons Farm (later renamed Hornchurch) near London all the way up to Innerwick, east of Edinburgh (with extensions in Norfolk and Kent). But it's not a physical barrage, for the most part -- it's aerodromes and searchlights. Previously, home defence squadrons had been placed close to target areas, because of doubts about night navigation and interception. Experience had shown that these problems weren't as great as previously thought:
Now that it was clear the aeroplane patrols could be extended, it was suggested that the Flights situated near Birmingham, Sheffield and Leeds should be moved farther east as a step towards the ultimate establishment of a barrage-line of aeroplanes and searchlights parallel with the east coast of England.
This system worked very well against Zeppelins (as one indication, note the steep drop in casualties due to airship raids from 1917 on). But not so well against Gothas.
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