Their purpose was to preserve the security of the Protectorate from both internal threats and external aggression.

There was internal order and immunity from external aggression.

Sovereign states have the right to defend themselves against overt external aggression, in the form of an invasion or other attack.

We've disabled Iraq's ability to launch external aggression from the west.

An army facing possible disintegration is not a reliable instrument for external aggression.

Provide a second line of defense in the wake of external aggression.

China will help Nepal defend against any external aggression.

Russia and China must be deterred from external aggression, but we cannot respond to every action they take along their borders.

The two neighbours stuck together through thick and thin, helping each other in times of external aggression.

The first problem, which obviously reflected the Korean events, was defence of the frontier against external aggression.