One of the main reasons for the development of the battle cruiser has been the fact that her high speed and great offensive power enable her to gain positions of advantage and utilize them.

The _A_ positions shown in the figures are attainable by battle cruisers against battleships, and are very effective.
A procedure analogous to that of flanking is one in which part of a force is attacked when it is separated from the rest of the force, and cannot be supported by it--in that some of the weapons of one force cannot be used.

The effect is similar in the two cases, but the events leading up to the two conditions may be quite different.
In the former case, that of being flanked, or T'd, the force caught at a disadvantage was together, and was able to operate effectively as one force against a force located in a given direction; but was attacked by a force located in another direction; while in the latter case, the force was divided, and one part was caught, while distant from and entirely unsupported by the other part.

The former condition is more likely to result from tactical operations, and the latter from strategical operations--and yet, especially in land operations, the flanking of one force may be brought about by the carefully planned strategical combinations of the other force; and catching one part of the enemy's force unsupported by the other parts may take place during the tactical maneuvers of an actual or a simulated battle.
In naval operations, the catching of separated parts of an enemy's force is a more frequent attempt and accomplishment than is that of getting a position where a column of ships can be attacked from ahead or astern.

It seldom happens, with the great number of vessels of all kinds which compose a modern fleet, that it is practicable to keep the various parts together, or that it would be desirable to do so.