CO_968_580_DEFENCE_OF_HONG_KONG_1957_1959 — Page 79

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installations.

Warning of Attack

15.

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Security measures in Communist China are strictly

enforced, and information on movement of the armed forces is

accordingly difficult to obtain. It is unlikely that precise

warning of imminent attack could be obtained other than in

exceptional circumstances.

16.

An attack on the Colony is unlikely to take place

without a prior worsening of international relations and of

the internal situation in Hong Kong, possibly leading even to

closure of the land frontier and restrictions on sea movement.

At the same time, Chinese Communist land and airborne forces

might be built up and re-positioned, and amphibious and

supporting fleets might have to be assembled. These

deliberate moves would be very difficult to conceal.

17.

In this connection, the build-up of Chinese Communist

ground forces North of the land frontier is unlikely in itself

to provide warning of imminent attack. Such a build-up could

take place progressively over a long period; troops being

concealed in the numerous tunnels in the Sino-British frontier

area. It is noticeable that the general tendency has been for

the Chinese army adjacent to the Sino-British border to move

closer, as communications and camps in the area are improved.

At present we consider that the ground force could concentrate

in the frontier tunnels for an attack in the course of two

nights. This concentration might not be observed.

18.

As regards air forces, air divisions are often in

transit through South China and the grouping of such aircraft

in the Canton area would therefore not necessarily on its own

indicate the imminence of attack. However, the concentration

of large numbers of transport aircraft in the Canton area

would be a good indication of the likelihood of an airborne

assault, as these aircraft would have to be assembled fairly

near to the Colony to enable them to carry out quick follow-up

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Page7f1upply sorties.

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