Despite the freezing cold weather, today the Germans under Mackensen attack the Russians at Bolimów, near Warsaw in Poland. The attack is a diversion, designed to make the Russians think that the Germans are still focussed on Poland when in fact Hindenburg and Ludendorff are planning a new offensive in the Masurian Lakes region. It is also a test of a terrible new weapon: poison gas. The Germans fire thousands of shells at the Russians containing xylyl bromide, a non-lethal irritant.
The gas attack proves unsuccessful. The extreme cold causes the gas to freeze and fall harmlessly to the ground. The Germans resolve to wait for warmer weather before experimenting further with chemical warfare. They also consider using more lethal gasses in future attacks.
image source (Wikipedia)