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Rh Dumouriez had foreseen, Brunswick deemed it unsafe to march upon the capital with so large a hostile force left in his rear between his advancing columns and his base of operations. The young King of Prussia, who was in the allied camp, and the emigrant princes eagerly advocated an instant attack upon the nearest French general. Kellerman had laid himself unnecessarily open, by advancing beyond Dampierre's camp, which Dumouriez had designed for him, and moving forward across the Aube to the plateau of Valmy, a post inferior in strength and space to that which he had left, and which brought him close upon the Prussian lines, leaving him separatedy by a dangerous interval from the troops under Dumouriez himself. It seemed easy for the Prussian army to overwhelm him while thus isolated, and then they might surround and crush Dumouriez at their leisure. Accordingly the right wing of the allied army moved forward in the grey of the morning of the 20th of September, to gain Kellerman's left flank and rear, and cut him off from retreat upon Chalons, while the rest of the army, moving from the heights of La Lune, which here converge semi-circularly round the plateau of Valmy, were to assail his position in front, and interpose between him and Dumouriez. An unexpected collision