Thirdly, there is the principle of throwing one squadron in superior force upon one end of the enemy's formation, and using the other squadrons to cover the attack or support it if need arose.

Fourthly, there is the principle of concealment--that is, disposing the squadrons in such a manner that even after the real attack has been delivered the enemy cannot tell what the containing squadrons mean to do, and in consequence are forced to hold their parrying move in suspense.

The memorandum also included the idea of concentration, and this is often spoken of as its conspicuous merit.

But in the idea of concentration there was nothing new, even if we go back no further than Rodney.

It was only the method of concentration, woven out of his four fundamental innovations, that was new.