Now I think that these extracts sufficiently defend Clausewitz from the imputation of too great a belief in frontal attacks, and considering the frequent success of such Napoleonic attacks in his day, he gives a very fair summing up of the relative advantages and disadvantages thereof, and indeed such as might be written in the present day. Indeed the quite abnormal conditions of the Boer war produced such a feeling against frontal attacks, and so much loose talk of their being extinct, that it is very useful to turn to Clausewitz for a reminder that breaking the centre, whenever the condition he postulates, namely _over-extension of front_ on the enemy's part, is present, will always remain one of the two great forms of decisive attack open to a commander. And as in our day the forces are so enormous that to reach the hostile flank becomes more difficult, and the extension of front becomes so gigantic (a front of several armies on a line of forty to seventy miles perhaps), it is well to consider whether breaking the enemy's centre will not again offer the most advantageous form for the final decisive act, coupled of course, as Clausewitz says it ALWAYS MUST be, with a strong flank attack. And in these gigantic battles of the future, such as Liao-yang and Mukden, which we must consider typical of the future, battles which must take several days, during which the troops in the first line become utterly exhausted and used up,--a decisive attack on the centre can well be imagined after the hostile reserves have been decoyed away over a day's march by a strong flank attack. As, for example, Nogi's flank attack round Mukden followed by Nodzu's decisive breaking the centre and capture of Mukden itself. So that far from thinking Clausewitz's remarks about frontal attacks and breaking the line to be obsolete, it rather appears from the great Russo-Japanese battles that they are worthy of close study in view of the future. TACTICAL VERSUS STRATEGICAL ENVELOPMENT