2. Battle of Ypres

The Second Battle of Ypres was a conflict that took place between 22 and 25 April 1915 near the Belgian town of Ypres (Ieper) on the Western Front of the First World War. This battle is notable for being the first time poison gas (chlorine) was used on a large scale as a weapon.

Beginning and Planning of the Battle

In the spring of 1915, the German army aimed to launch a limited offensive on the Western Front. The primary objectives were to conceal the movement of troops being transferred to the Galicia Front, break the Allied pressure on the Ypres Salient, and shorten the defensive line to establish a new defensive arrangement. Although intelligence reached British and French headquarters on 14 April 1915 indicating that the Germans intended to use poison gas, the troops were not adequately informed about the effects of such an attack.

Use of Chemical Weapons

On 22 April 1915, German forces released approximately 150 to 180 tons of chlorine gas against the northern sector of the Ypres Salient, where French and Algerian units were positioned. This first attack created a major breach in the Allied defenses; the French lines collapsed and thousands of soldiers either died from the gas or were forced to abandon their positions. On 24 April, a second gas attack was launched against Canadian units. However, this defense was more resilient. Despite heavy casualties, the Canadian forces held their ground and limited the German advance.

First Gas Attack – 22 April 1915

At around 17.00, the German 4th Army, stationed near the village of Langemark northwest of Ypres, released 168 tons of chlorine gas stored in 5,730 cylinders, carried by westerly winds toward the French lines.

Units in the Target Area

• French 45th Algerian Division (Zouave units)
• Territorial (reserve) units
• Canadian troops

Effects and Consequences

Chlorine gas caused suffocation and internal bleeding by reacting with moisture in the lungs. French soldiers, lacking protective equipment, panicked. A front line approximately 6 kilometers wide completely collapsed. The French suffered over 6,000 casualties; many soldiers died instantly or fled while choking. The Germans, instead of exploiting the initial success, acted cautiously and delayed their advance. As a result, the large gap created was not fully exploited.

Second Gas Attack – 24 April 1915

Following the first attack, the Canadian 1st Division was forced to defend the front after the French lines had been breached. Two days later, on the morning of 24 April, the Germans launched another chlorine gas attack, this time directly targeting Canadian troops.

Canadian units attempted to protect themselves using improvised methods such as wet cloths and cloths soaked in urine. The cloths covering their mouths and noses provided temporary protection. Despite heavy losses, the Canadian 1st Division refused to abandon their positions, preventing the fall of Ypres.

Global Impact of the Gas Attack

This attack marked the first institutionalized use of chemical weapons in warfare. Its impact was devastating both militarily and psychologically. In response, the Allies, beginning with Britain and France, began producing chemical weapons. Gas mask usage rapidly spread. By the end of 1915, the British began using phosgene gas; in 1917, the Germans developed the more lethal mustard gas (iprit).

Measures Taken Against the Attacks

Improvised Protective Measures (22–24 April 1915)

The first gas attack (22 April) targeted French-Algerian units. As the attack was unexpected, no protective gear was available. During the second attack (24 April), which targeted Canadian troops, some improvised measures were adopted.

Protecting Respiratory Organs with Wet Cloth or Fabric

Soldiers used handkerchiefs, sock, and pieces of cloth to cover their mouths and noses. These cloths were soaked in water or urine in an attempt to prevent chlorine from entering the respiratory system. Since chlorine is soluble in water, damp cloth could filter out a portion of the gas.

Lowering the Body to the Ground and Adopting Low Positions

Chlorine gas is heavier than air and settles near the ground. Soldiers therefore crouched at the lowest point of their trenches to breathe cleaner air and attempted to adjust their positions according to wind direction. However, this was often impossible and provided only partial protection.

Primitive Gas Masks (Autumn 1915)

After the Second Battle of Ypres, the British and French began developing systematic protective measures against chemical attacks.

Piss Helmet (P Helmet) – The British First Mask

This mask featured a fabric hood designed to cover the entire face. The interior was treated with a chemical absorbent solution such as sodium thiosulfate. However, its effectiveness was limited and it offered only temporary protection against chlorine gas.

Hypo Helmet (H Mask) – Improved Model

This was an improved version of the previous model. Absorbent materials such as carbonate and thiosulfate were incorporated. Celluloid eye pieces were added to protect the eyes.

French Designs

The French initially recommended cotton handkerchiefs. Later, they used simple systems combining cotton and gas masks. From 1916 onward, more advanced models with active carbon filters were produced.

A Visual Representing the Battle (Generated by Artificial Intelligence.)

Results and Casualties

No clear victor emerged from the Second Battle of Ypres. Both side suffered heavy losses: the Allied Powers lost approximately 70,000 troops, while Germany lost about 35,000. The town of Ypres and its surroundings were largely destroyed, but the Allies succeeded in holding the town.

By the end of the battle, the Ypres Salient had been reduced in size, and part of the higher ground had fallen into German hands. However, the Germans failed to turn this strategic advantage into a decisive victory.

Effects and the Evolution of Chemical Warfare

The Second Battle of Ypres marked the modern point at which chemical weapons were introduced into warfare. This practice, initiated by the Germans, was later adopted by the British, French, and eventually the Americans who joined the war. The use of more lethal substances such as mustard gas in 1917 intensified the impact of chemical warfare.

Cultural Reflections

This battle left a lasting imprint not only through its military consequences but also through its cultural impact. Canadian doctor John McCrae wrote the poem “In Flanders Fields” in memory of those who died in this conflict, and the poppy flower became one of the symbols of the First World War.

The Second Battle of Ypres is regarded in military history as the beginning of chemical warfare and a symbol of the brutality of modern war. Although the Germans achieved no significant military gains, the humanitarian tragedy unleashed by the use of chlorine gas has left a road stain on the history of warfare as a black moral failure.