The Third Battle of Ypres

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In 1915, at the second Battle of Ypres, the Germans used chlorine gas for the first time in warfare and succeeded in driving the British back to the town of Ypres. Here a bulge, or salient, was formed in their front line which left the town exposed on three sides to shellfire. The town was gradually destroyed, although of course it continued to be used as an important military centre for the Allied lines and all troops left for the front line through the Menin Gate.

In 1917, the area of Flanders to the east of Ypres had great strategic importance because it was dominated by a German occupied ridge from the East to the South of Ypres. This was the only high ground in a flat, featureless plain and, if the British could only break out of the Ypres salient and take it, they could turn North and drive the Germans from the Belgian coast and capture the ports of Ostend and Zeebrugge from the enemy. The German position in Belgium would be outflanked and their industrial heartland in the Ruhr would be under threat.

U-boats were operating out of Zeebrugge with great success and the Admiralty was increasingly gloomy about what would happen in the English Channel if the Belgium ports were not closed to the enemy. Pressure had consequently been put on Field Marshal Haig to make an attack in Flanders. Haig's plan was to strike out of Ypres to the North and East and, in conjunction with a seaborne landing on the coast of Belgium at Nieuport, he would capture the high ground at Passchendaele which was the key to the whole area. This would allow the cavalry to be released in open country and sweep all before them to the coast.  This would lead to the Third Battle Of Ypres.

Haig, who had been trained as a cavalryman firmly believed that cavalry had a place in modern war; he was a very stubborn unimaginative man who completely disregarded the effects of barbed wire, machine guns, shells and fire from aircraft on the very vulnerable horses.

An attack in Flanders would also hold down the German reserves and relieve the pressure on the French, who needed time to recover from the bloody shambles of Verdun that had caused the French army to mutiny.

Three main factors that should have been addressed prevented Haig's plans from being successful: these were the battlefield itself, the weather and the German defences.

The Battlefield 

The Ypres salient occupied a low-lying, gently undulating pastureland, which had been reclaimed from marsh over the years by an elaborate drainage system. The water table was near the surface, even at the height of summer, and this reclaimed land was extremely vulnerable to shellfire that would destroy the drainage system and allow the land to flood. There was no layer of gravel and flooding would rapidly turn the whole battlefield into mud once the shelling started.

The low ridge from Keppel to Passchendaele was shaped rather like a sickle with the handle at Messines and the blade sweeping round Ypres with Passchendaele at the tip and this ridge dominated the battle area.

The Steenbeeck was one of a number of insignificant little streams that were to achieve great importance, after shelling and rain transformed them into an insurmountable barrier across the axis of the attack, because of the bog created by the shelling.

Although Haig had been warned about this, he hoped that the breakthrough would be so swift that the land would not have time to bog. He seemed to be an incurable optimist who was quite incapable of learning from his recent experiences on the Somme!

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The weather

Flanders was notorious for wet weather that usually started in the late autumn and the plan was for the attack to start in July, after the successful but limited Battle of Messines in June. It was known that July and August were the most unpredictable months of the year and heavy thunderstorms were possible at any time. September was the best month as it was dry for one out of four years (1917 was one of those years!) October was usually the wettest month of the year and usually marked the beginning of winter.

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