This second phase develops continually as the numbers of the arriving Prussians increase, until it is clinched by the appearance of Ziethen's corps at the very end of the day, and the break-up of the French army; this second part is therefore itself capable of considerable subdivision. But in any large and general view of the whole action, we must regard it as divided into these two great chapters, during the first of which is engaged the doubtful struggle between Napoleon and Wellington; during the second of which the struggle, no longer doubtful, is determined by the arrival of the Prussians in flank upon the field. [Illustration: ELEMENTS OF WATERLOO.] THE FIRST PART OF THE ACTION _Before the Arrival of the Prussians_ The action was to take the form of an assault by Napoleon's forces against this defensive position held by Wellington. It was the business of Wellington, although his total force was slightly inferior to the enemy in numbers,[17] and considerably inferior in guns, to hold that defensive position until the Prussians should come up in flank. This he had had word would take place at latest by one or two o'clock. It was the business of Napoleon to capture the strong outworks, Hougomont and La Haye Sainte; and, that done, to hammer the enemy's line until he broke it. That delay in beginning this hammering would be fatal; that the Prussians were present upon his flank, could arrive in the midst of the battle, and were both confidently and necessarily expected by his enemy; that his simple single battle would turn into two increasingly complex ones, Napoleon could have no idea. Napoleon could see no need for haste. A long daylight was before him. It was necessary to let the ground dry somewhat after the terrible rain of the day before if artillery was to be used effectively; nor did he press his columns, which were moving into position all through the morning, and which had not completely deployed even by eleven o'clock. It was a little after that hour that he dictated to Soult the order of battle. Its first and effective phrases run as follows:-- "Once the whole army is deployed, that is, at about half-past one, at the moment when the Emperor shall send the order to Marshal Ney, the attack is to be delivered. It will have for its object the capture of the village of Mont St Jean and the cross-roads...." The remainder of the order sets out forces to be engaged in this first attack. The French forces consisted in the IInd Army Corps deployed to the left or west of the road, the Ist to the right or east of it, and behind Napoleon, in the centre and in reserve, the VIth Corps and the Guard.