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After this engagement, mareschal Lehwald changed the position of his army, by drawing towards Peters-wald; and the Russians, after remaining quite inactive till the thirteenth of September, on a sudden, to the great surprise of every one, retreated out of Prussia with such precipitation, that they left all their sick and wounded behind them, to the amount of fifteen or sixteen thousand men, together with eighty pieces of cannon, and a considerable part of their military stores.