By then the Austrians were alerted to the battle. From their camps further to the south and more protected by the river, Austrian troops moved to the front. The Prussians who had still not crossed the Striegau to the north wheeled to the west and advanced through river crossings wherever they could find them, finding enough fords to accomplish this. A bridge collapse at the small town of Graben forced the cavalry commander, Hans Joachim von Zieten, to find a ford further south through which to funnel cavalry and pack mules carrying supplies.