The very large but poorly equipped Russian army fought tenaciously and desperately at times despite its lack of organization and very weak logistics. Casualties were enormous. In the 1914 campaign, Russian forces defeated Austro-Hungarian forces in the Battle of Galicia. The success of the Russian army forced the German army to withdraw troops from the western front to the Russian front. However, the shell famine led to the defeat of the Russian forces in Poland by the central powers in the 1915 campaign, which led to a major retreat of the Russian army. In 1916, the Russians again dealt a powerful blow to the Austrians during the Brusilov offensive.