Unable to break the spirit and fortitude of Kyiv’s forces with conventional weapons, the Kremlin is now resorting to WW1-style gas attacks ... a trench stalemate at Ypres in April 1915.

Tactics changed, direct attacks and horseback charges ... The first major use of poison gas in World War One came on 22nd April 1915 at Ypres in Belgium. The German army released chlorine gas ...

On April 22 1915, a greenish fog drifted over the battlefield north of Ypres in Belgium ... an estimated 90,000 people were killed by gas attacks, and a further 1.2 million injured, sometimes ...

During the First World War, gas attacks killed or injured an estimated ... Division took up position alongside French troops near Ypres, the last Belgian city not captured by the Germans.