Looking out across a battlefield from an Anzac pill box near the Belgian city of Ypres in West Flanders in 1917. When German forces met stiff resistance in northern France in 1914, a "race to the sea" developed as France and Germany tried to outflank each other, establishing battle lines that stretched from Switzerland to the North Sea. Allies and Central Powers literally dug in, excavating thousands of miles of defensive trenches, and trying desperately to break through the other side for years, at unspeakably huge cost in blood and treasure. [Editor's note: Photographer James Francis Hurley was known to have produced a number of WWI images that were composites of pieces of several photos, and it is possible this image is a composite as well.] #

Bombardment of the Cathedral of Reims, France, in September of 1914, as German incendiary bombs fell on the towers and on the apse during the German invasion of northern France. #

A French pilot made an emergency landing in friendly territory after a failed attempt to attack a German Zeppelin hangar near Brussels, Belgium, in 1915. Soldiers are climbing up the tree where the biplane has landed. #

German officers in a discussion on the Western Front. (The man 2nd from right, in fur collar is possibly Kaiser Willhelm, the caption does not indicate). The German war plan had been for a swift, decisive victory in France. Little planning had been done for a long-term, slow-moving slog of a battle. #

French soldiers in a bayonet charge, up a steep slope in the Argonne Forest in 1915. During the Second Battle of Champagne, 450,000 French soldiers advanced against a force of 220,000 Germans, momentarily gaining a small amount of territory, but losing it back to the Germans within weeks. Combined casualties came to more than 215,000 from this battle alone. #

Six German soldiers pose in a in trench with machine gun, a mere 40 meters from the British line, according to the caption provided. The machine gun appears to be a Maschinengewehr 08, or MG 08, capable of firing 450-500 rounds a minute. The large cylinder is a jacket around the barrel, filled with water to cool the metal during rapid fire. The soldier at right, with gas mask canister slung over his shoulder, is peering into a periscope to get a view of enemy activity. The soldier at rear, with steel helmet, holds a "potato masher" model 24 grenade. #

German captive balloon at Equancourt, France, on September 22, 1916. Observation balloons were used by both sides to gain an advantage of height across relatively flat terrain. Observers were lifted in a small gondola suspended below the hydrogen-filled balloons. Hundreds were shot down during the course of the war. #

French Reserves from the USA, some of the two million fighters in the Battle of the Marne, fought in September of 1914. The First Battle of the Marne was a decisive week-long battle that halted the initial German advance into France, short of Paris, and led to the "race to the sea". #

Soldiers struggle to pull a huge piece of artillery through mud. The gun has been placed on a track created for a light railway. The soldiers are pushing a device, attached to the gun, that possibly slots into the tracks. Some of the men are in a ditch that runs alongside the track, the rest are on the track itself. A makeshift caterpillar tread has been fitted to the wheels of the gun, in an attempt to aid its movement through the mud. #

Members of New Zealand's Maori Pioneer Battalion perform a haka for New Zealand's Prime Minister William Massey and Deputy Prime Minister Sir Joseph Ward in Bois-de Warnimont, France, during World War I, on June 30, 1918. #

A German prisoner, wounded and muddy, helped by a British soldier along a railway track. A man, possibly in French military uniform, is shown behind them, holding a camera and tripod, ca. 1916. #

Dead horses are buried in a trench after the Battle of Haelen which was fought by the German and Belgian armies on August 12, 1914 near Haelen, Belgium. Horses were everywhere in World War I, used by armies, and caught up in farm fields turned into battlefields, millions of them were killed. #

Ruins of Gommecourt Chateau, France. The small community of Gommecourt sat on the front lines for years, changing hands numerous times, and was bombed into near-oblivion by the end. #

Soldiers in trenches during write letters home. Life in the trenches was summed up by the phrase which later became well-known: "Months of boredom punctuated by moments of extreme terror." #

At Cambrai, German soldiers load a captured British Mark I tank onto a railroad, in November of 1917. Tanks were first used in battle during World War I, in September of 1916, when 49 British Mark I tanks were sent in during the Battle of Flers-Courcelette. #

At a height of 150 meters above the fighting line, a French photographer was able to capture a photograph of French troops on the Somme Front, launching an attack on the Germans, ca. 1916. The smoke may have been deployed intentionally, as a screening device to mask the advance. #

British soldiers on Vimy Ridge, 1917. British and Canadian forces pushed through German defenses at the Battle of Vimy Ridge in April of 1917, advancing as far as six miles in three days, retaking high ground and the town of Thelus, at the cost of nearly 4,000 dead. #

French soldiers make a gas and flame attack on German trenches in Flanders, Belgium, on January 1, 1917. Both sides used different gases as weapons during the war, both asphyxiants and irritants, often to devastating effect. #

French soldiers wearing gas masks in a trench, 1917. gas mask technology varied widely during the war, eventually developing into an effective defense, limiting the value of gas attacks in later years. #

Gassed patients are treated at the 326th Field Hospital near Royaumeix, France, on August 8, 1918. The hospital was not large enough to accommodate the large number of patients. #

British soldiers and Highlanders with German prisoners walk past war ruins and a dead horse, after the Battle of the Menin Road Ridge, part of the Third Battle of Ypres in September of 1917. The sign near the railroad tracks reads (possibly): "No Trains. Lorries for Walking Wounded at Chateau [Potijze?]". #

Cleaning up German trenches at St. Pierre Divion. In the foreground a group of British soldiers are sorting through equipment abandoned in the trenches by the Germans when St Pierre Divion was captured. One soldier has three rifles slung on his shoulder, another has two. Others are looking at machine gun ammunition. The probable photographer, John Warwick Brooke, has achieved considerable depth of field as many other soldiers can be seen in the background far along the trenches. #

A mine tunnel is dug under the German lines on the Vosges front, on October 19, 1916. The sappers worked at a depth of about 17 meters, until they reached a spot below enemy positions, when large explosives would be placed and later detonated, destroying anything above. #

Men wounded in the Ypres battle of September 20th, 1917. Walking along the Menin road, to be taken to the clearing station. German prisoners are seen assisting at stretcher bearing. #

Soldier's comrades watch him as he sleeps, near Thievpal, France. Soldiers are standing in a very deep, narrow trench, the walls of which are entirely lined with sandbags. At the far end of the trench a line of soldiers are squashed up looking over each others' shoulders at the sleeping man. #