On the 22nd, Soult was at Laon endeavouring to collect the remnants of Napoleon’s army. He succeeded in gathering some 3,000 fugitives, mostly of Reille’s Corps and d’Erlon’s, and with these he hoped to join Grouchy. Urgent messages from Paris implored Grouchy to unite all the forces he could find and oppose the advance of the allies. This was easier said than done, for it was now a race between Blucher and Grouchy. Grouchy had to take a long detour to avoid being cut off; while the Prussians could advance direct on Paris, leaving detachments to watch the fortresses which might prove dangerous in the rear, and keeping close observation on the left flank on Grouchy’s operations. Those fortresses which had not been taken by Zieten and Bulow were blockaded by Pirch, and nearly all of them--at least all those which menaced the advance--being garrisoned by ill-spirited and disheartened troops, and capable of little resistance, were compelled to surrender. But Blucher was careful to take no risks, and systematically he cleared the way for his advance. The shorter line by which he marched ensured his reaching Paris before Grouchy, if only with one Corps. Retreating troops move quickly, but the Prussians proved themselves capable of some wonderful forced marches. For the French it was a time when the Napoleon of former days would have revived the broken fortunes of his country, and rallied every soldier for the protection of Paris. He would have brought up all the troops in the West, from the Pyrenees, and from the Alps; and he would have led a new army of 100,000 or 150,000 men against Blucher. The old strategy of 1814 would have been repeated, and many a loss suffered by the allies before they could bring all their six armies to converge on Paris. But now there was no Napoleon to fill the vacancy. The Emperor was defeated in Paris as well as at Mont St Jean. He had no party, no power; Frenchmen were wearied and sickened by the disasters he had brought on their country through his insatiable ambition. Grouchy alone showed power and resolution; yet he only led his forces in retreat. Could he still save the country? The 23rd was a day of comparative rest for the Prussian army. Blucher was anxious to draw in his Corps for his advance on Paris. Thielemann moved from Beaumont to Avesnes. On the 24th the advance was resumed. The Prussian army was to march in two columns. On the left, nearer Grouchy, Zieten’s and Thielemann’s Corps were to march by the valley of the Oise on Compiègne, keeping a sharp watch for Grouchy. On the right, Bulow’s Corps, the Fourth, was to march by St Quentin, Ham, Roye, to Pont St Maxence.