On 8 June forces of the Southwestern Front took Lutsk. The Austrian commander, Archduke Josef Ferdinand, barely escaped the city before the Russians entered, a testament to the speed of the Russian advance. By now the Austrians were in full retreat and the Russians had taken over 200,000 prisoners. Brusilov's forces were becoming overextended and he made it clear that further success of the operation depended on Evert launching his part of the offensive. Evert, however, continued to delay, which gave the German high command time to send reinforcements to the Eastern Front.