Germany’s Mackensen is commanding a combined Austro-Hungarian and German offensive on the Eastern Front, attacking the Russians in Galicia between Gorlice and Tarnów. On the first day of the offensive the Russian line was shattered. Now the Russians throw an entire corps at the enemy in a counter-attack, desperately hoping to stabilise the line.
The counter-attack fails. The Russians are thrown back and many of their units start to disintegrate. The Germans and Austro-Hungarians have achieved a breakthrough: they are now advancing through open country.