It would be tiresome to recount all the battles both on sea and land, in which smaller forces defeated forces numerically greater; but it may not be possible by any other means to force the fact on the attention--even sometimes of naval officers--that material vessels, guns, etc., are merely instruments, and that the work gotten out of any instrument depends not only on the instrument itself, but on the skill with which it is employed. Usually, when thinking or speaking of the power of any instrument (or means or method or organization) we mean the power of which it is capable; that is, the result which it can produce, _if used with_ 100 _per cent of skill_. Possibly, we are subconsciously aware that we assume perfect skill; but whether we are or not, we have become so accustomed to the tacit acceptance of the phrase, "other things being equal," that we have come to forget that other things may not be equal at all; and that they certainly will not be on the day of trial, if we forget or undervalue those other things, while our antagonist does not. Let us always remember, then, that the effective work gotten out of any means or instrument is the product of the maximum capability of the means or instrument and the skill with which it is used; that, for instance, if two fleets fight, which are numerically equal in material and personnel, but in which the skill of the personnel of the A fleet is twice as great as the skill of the personnel of the B fleet, the A fleet will be twice as powerful as the B fleet.