This independence must never be allowed to degenerate into selfish wilfulness; the actual situation, as encountered on the ground itself; must never be considered from the subordinate's point of view only, but rather must always be solved in the spirit of the original conception formed in the Leader's mind. In the second place, the Leader requires tactical means and forms of evolution which combine, with elementary simplicity and clearness, the greatest possible degree of adaptability. Nowhere else so much as with the Cavalry does the maxim hold good that 'In War only the simple secures success.'[5] [Footnote 5: Clausewitz, 'Im Krieg ist aller Einfach, aber, das Einfache ist schwer.'] The prescribed orders must not place a strain on the memory of the Leader or troops, and must operate practically mechanically. Even the most far-reaching movements should never require either detailed instructions or commands. The application of the word of command should be limited to those units which it can actually control--namely, the squadron. The use of bugle-calls must be restricted to the utmost, and only be permitted in circumstances where no possibility of misunderstanding can arise--a danger not easily excluded where large bodies are acting together. Even the use of signs can only be relied on in a limited degree. In dust and closed country of course they cannot be seen. On the other hand, all movements depending on verbally transmitted commands must be executed without loss of the spirit of uniformity. In practice this is the only form for the communication of orders which can be depended on to act with any degree of certainty under all circumstances. The Regulations must insure the possibility that, no matter under what conditions, the unit can be formed without many words or commands into the most diverse fighting formations in any required direction, either from column of route, rendezvous formation, or even from the melee. Fundamental principles of action against the different Arms must be laid down so definitely that complicated orders in each particular case will not be required. The rapid change from one fighting form to another must be absolutely guaranteed, and equally so the possibility for each unit to assume that formation in depth called for by the circumstances of the combat, without recourse to complicated orders and movements.[6] [Footnote 6: The Regimental Commander, therefore, requires his Adjutant and an Orderly Officer, so as to be able to transmit simultaneously his order to both wings of his regiment.] If these requirements are to be fulfilled, then only such elementary movements must be prescribed and regulated as can be executed under all circumstances, as laid down in the Regulations.