Cavalry retained an important role in this age of regularization and standardization across European armies. They remained the primary choice for confronting enemy cavalry. Attacking an unbroken infantry force head-on usually resulted in failure, but extended linear infantry formations were vulnerable to flank or rear attacks. Cavalry was important at Blenheim (1704), Rossbach (1757), Marengo (1800), Eylau and Friedland (1807), remaining significant throughout the Napoleonic Wars.