Historic Photos from World War I Reveal the Harsh Reality of the First Modern War

On June 28, 1914, a single gunshot in Sarajevo changed the world. Gavrilo Princip, a member of the Serbian nationalist group known as the Black Hand, assassinated Archduke Franz Ferdinand of Austria-Hungary. Within weeks, a web of political alliances pulled nation after nation into conflict. Austria-Hungary declared war on Serbia on July 28. Russia mobilized to defend Serbia. Germany declared war on Russia and France. When German troops marched through neutral Belgium to reach France, Great Britain declared war on Germany on August 4, 1914. The world had never seen a war like this before.

The war split Europe into two opposing sides. The Allied Powers included Great Britain, France, Russia, Italy, and eventually the United States. Against them stood the Central Powers: Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria. Fighting broke out on multiple fronts, but the Western Front — stretching through France and Belgium — became the war’s defining theater. When the German advance into France stalled at the Battle of the Marne in autumn 1914, both sides began digging. By the end of that year, a continuous line of defensive trenches ran 475 miles from the Swiss border to the North Sea.

The war drew soldiers from across the globe. France mobilized troops from its colonies in Indochina, North Africa, and West Africa. Britain called on soldiers from India, Australia, New Zealand, and Canada. These men arrived in Europe speaking different languages and wearing unfamiliar uniforms, but they all faced the same mud, artillery, and machine gun fire.

Life inside the trenches was relentless and brutal. The ditches were typically six to eight feet deep, dug into waterlogged ground that never fully drained. Mud and stagnant water were constant companions. Soldiers developed trench foot when their feet stayed wet for days, causing tissue to rot and sometimes requiring amputation. Rats infested the trenches and raided food supplies. Lice spread trench fever, a painful illness that kept men out of action for weeks. Between the opposing trench lines lay No Man’s Land — a ravaged stretch of shell craters and barbed wire where few men survived a direct charge.

Attacking across No Man’s Land meant running into machine gun fire capable of 600 rounds per minute. The results were catastrophic. On the first day of the Battle of the Somme in July 1916, the British army suffered 57,000 casualties. By the time the battle ended in November, the Allies had gained only seven miles of ground. At Verdun, a battle that lasted ten months beginning in February 1916, over 700,000 soldiers were killed, wounded, or went missing. Germany had launched the Verdun offensive specifically to bleed the French army dry through attrition — and both sides paid an enormous price.

New weapons transformed warfare in ways no military strategist had anticipated. In 1915, German forces unleashed chlorine gas at the Second Battle of Ypres, causing victims to suffocate as the gas destroyed lung tissue. Both sides later deployed mustard gas, which was harder to detect and caused severe blistering on skin and inside the eyes. Soldiers were required to carry heavy rubber gas masks at all times. The British introduced tanks to break through barbed wire and cross No Man’s Land. The first model, the Mark I, crawled at just three miles per hour but offered protection against rifle fire that open infantry had no answer to.

Aircraft were used from the war’s earliest days, at first only for scouting enemy positions. Pilots soon began mounting machine guns on their planes, turning the skies into battlegrounds. German Fokker fighters and Allied aircraft clashed in intense dogfights above the trenches. Germany also deployed hydrogen-filled Zeppelin airships to bomb British cities, bringing the war directly to civilian populations.

At sea, Germany used submarines — called U-boats — to strangle British supply lines. In May 1915, a German U-boat torpedoed the British passenger liner Lusitania, killing 1,198 people, including 128 Americans. The sinking intensified American public anger toward Germany. Early in 1917, British intelligence intercepted the Zimmermann Telegram, a secret German message offering Mexico assistance in reclaiming Texas, New Mexico, and Arizona in exchange for entering the war against the United States. Combined with Germany’s renewed unrestricted submarine warfare, this brought the United States into the conflict on April 6, 1917.

The Eastern Front operated very differently from the stalemate in the west. Russian forces pushed into German territory early in the war but suffered a catastrophic defeat at the Battle of Tannenberg in August 1914. The Russian army frequently lacked enough rifles and boots for its own soldiers. By 1917, food shortages and massive casualties had turned the Russian public against the war entirely. The Russian Revolution swept away the Tsar’s government, and the new Bolshevik leadership signed the Treaty of Brest-Litovsk with Germany in early 1918, withdrawing Russia from the war completely.

The war was also fought far beyond Europe’s borders. In 1914, Japanese forces — allied with Britain — laid siege to the German-held port of Tsingtao in China, using artillery bombardments and coordinated infantry assaults to capture it. British and Australian troops fought the Ottoman Empire in the Gallipoli campaign of 1915, landing under fire on the Dardanelles coast in an attempt to knock the Ottomans out of the war. The campaign failed after months of grinding combat, and Allied forces were evacuated in late 1915.

In the Middle East, Allied forces pushed deep into Ottoman territory. British and Commonwealth troops advanced through Palestine, capturing Jerusalem in 1917. New Zealand mounted riflemen guarded German prisoners near Jericho. The fall of Jerusalem marked a significant turning point in the campaign against the Ottoman Empire, which signed an armistice in October 1918.

The war was a total war — meaning it consumed entire nations, not just their armies. Governments ran propaganda campaigns urging men to enlist and asking civilians to accept rationing. Women entered the workforce in enormous numbers, filling jobs in munitions factories, driving ambulances, and nursing the wounded near the front lines. They built the weapons, assembled the shells, and kept the supply chains running while men fought in the trenches.

In the spring of 1918, Germany launched its Spring Offensive, moving troops freed from the now-closed Eastern Front. Using stormtrooper tactics — bypassing heavily defended positions and striking deep into Allied lines — they drove within 75 miles of Paris. But the German army was exhausted and running low on supplies. The Allies launched the Hundred Days Offensive in August 1918, backed by fresh American troops. They shattered the German lines and began driving east.

The Central Powers crumbled one by one. Bulgaria signed an armistice in September 1918. The Ottoman Empire followed in October. Austria-Hungary signed on November 3. Inside Germany, sailors mutinied, workers went on strike, and Kaiser Wilhelm II abdicated and fled to the Netherlands. A new German government sent representatives to meet Allied leaders in a railway carriage in the Compiègne Forest. They signed the armistice that ended the fighting. It took effect at 11:00 a.m. on November 11, 1918 — the eleventh hour of the eleventh day of the eleventh month.

The scale of destruction was staggering. Over 65 million soldiers from around the world had served. Approximately 9 million died in combat. Another 21 million were wounded. Nearly 10 million civilians died from disease and starvation directly tied to the war. Eight billion artillery shells were fired across the war’s four years. The Treaty of Versailles, signed in 1919, formally ended the conflict. It required Germany to accept responsibility for the war, pay reparations, and cede territory. It also redrew the map of Europe and the Middle East, creating new nations including Poland, Czechoslovakia, and Yugoslavia.