METHODS OF SECURING CONTROL
1. Permanent general control can only be secured by the practical annihilation of the enemy's fleet by successful actions.
2. Local and temporary control may be secured by:—
(a) A defensive action not necessarily entirely successful (containing).
(b) Forcing concentration on the enemy elsewhere (diversion).
(c) Superior concentration so as to render impotent the enemy's force available in the special theatre of operations (masking or containing).
BLOCKADE
Blockades are of two natures, according to the object review. The object may be:—
(d) Blockade.
i. Close blockade to prevent the enemy putting to sea. The object being usually to secure local or temporary control.