The alarming increase of French power in Central Europe disturbed Prussia, which had remained neutral in the conflicts of the previous year. After much diplomatic wrangling, Prussia secured promises of Russian military aid and the Fourth Coalition against France came into being in 1806. The "Grande Armée" advanced into Prussian territory with the famed "bataillon-carré" (battalion square) system, whereby corps marched in close supporting distances and became vanguards, rearguards, or flank forces as the situation demanded, and decisively defeated the Prussian armies at Jena and Auerstedt, both fought on October 14, 1806. After a legendary pursuit, the French captured about 140,000 Prussians and killed and wounded roughly 25,000. Marshal Louis-Nicolas Davout's III Corps, the victors at Auerstadt, received the honours of first marching into Berlin. Once more, the French had defeated an enemy before its allies could arrive, and once more, this did not bring peace.