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228 would make sad havoc of the invasion; and quite a large number should arrive before that.

Consequently the Fleet would have to be provided against, even in a surprise invasion, A time would have to be selected when the Channel Fleet was west of Dover and refitting in its home ports. Of course, much could be done here. In profound peace it would probably not prove impossible to block Sheerness, and consequently Chatham, by destroying lightships and buoys, and by merchant ships sunk at the convenient moment. 'Blocking' in war has so far proved impossible both at Santiago and Port Arthur—each ideal harbours for the operation—but without the confusion of gun fire and search lights the operation might be feasible and everything inside the Medway—except perhaps torpedo craft—shut in. It might be possible to do the same thing at Portsmouth; at any rate it is tolerably obvious that some such action would occur together with the first landing or immediately before it. Outside both places and outside Plymouth mines could also be dropped. Finally the Straits of Dover would have to be held by the entire German fleet.