In the Southern half of the Eastern front, the Russians continued to advance against the Austro-Hungarian forces. Eventually, the Russian came upon Przemysl, a fortified city of strategic importance for its intersection upon rivers and roads.
Unfortunately for the Russians, its fortifications were quite imposing, and threatened to severely weaken any forces which attacked them. The map below highlights not only Przemysl’s tactical position (note the roads and rivers), but also the ring of fortresses which protected the city proper.
Seeing no easy way to take the city, the Russians began their siege on September 24, 2914. Though briefly interrupted in October, this siege would eventually be the longest of the entire First World War, stretching out into March of 1915.