In early 1917, British and French troops were launching futile offensives against German lines in Belgium and France, suffering greatly. The Central Powers were building their defensive capabilities, but launching limited offensives -- continuing a stalemate costing thousands of lives every month. Over the next year, a treaty between Russia and the Central Powers freed up German resources, but American troops began arriving in France by the thousands, and Allied command became more unified and effective. The tide began to turn decisively in July 1918, beginning with the Battle of Amiens, followed by the "Hundred Days Offensive", where Allies pushed German and Austro-Hungarian troops beyond the Hindenburg Line, forcing the Central Powers to seek a cease-fire. On November 11, 1918, all fighting ceased on the Western Front, after four years, and some eight million casualties. On this 100-year anniversary, I've gathered photographs of the Great War from dozens of collections, some digitized for the first time, to try to tell the story of the conflict, those caught up in it, and how much it affected the world. Today's entry is part 9 of a 10-part series on World War I, which will be posted every Sunday until June 29. Come back next week for Part 10.

A soldier of Company K, 110th Regt. Infantry (formerly 3rd and 10th Inf., Pennsylvania National Guard), just wounded, receiving first-aid treatment from a comrade. Varennes-en-Argonne, France, on September 26, 1918. (U.S. Army/U.S. National Archives)
London buses, shipped to France, being used to move up a division of Australian troops. Reninghelst. 2nd Division. (National Media Museum) #
German soldiers (rear) offer to surrender to French troops, seen from a listening post in a trench at Massiges, northeastern France. (Reuters/Collection Odette Carrez) #
A series of trenches, structures on fire, in a French war zone during World War I. (State Library of South Australia) #
A French soldier aiming an anti-aircraft machine gun from a trench at Perthes les Hurlus, eastern France. (Reuters/Collection Odette Carrez) #
(1 of 2) Street scene in Exermont. Beginning the night of September 30, 1918, the U.S. 1st Division advanced seven km down the Aire Valley in the face of German resistance, suffering 8,500 casualties. Photo taken while Exermont was still being shelled. See this same scene in 2010, on Wikipedia. (U.S. Army Signal Corps) #
(2 of 2) A moment after the preceding picture was taken, the warning screech of an incoming shell was heard, and the men scrambled for cover. (U.S. Army Signal Corps) #
The battles at Soissons. A captive balloon with its truck, equipped with a motor winch, in June of 1918. (National Archive/Official German Photograph of WWI) #
British soldier in a flooded dug-out, on the front lines, France. (National Library of Scotland/John Warwick Brooke) #
French soldiers stand in German trenches seized after being shelled on the Somme, northern France in 1916. (Reuters/Collection Odette Carrez) #
Lens, France, the devastated coal mining region of northern France, 220 coal pits rendered useless. (Library of Congress) #
Two Tanks knocked out of action near Tank Corner, Ypres Salient, October 1917. (Frank Hurley/State Library of New South Wales) #
In this aerial photo, a portion of an old reserve trench is visible near the Somme River, on the western front, in France. (AP Photo) #
(1 of 2) German storm troops race to occupy a newly-made mine crater near Ripent (Champagne). (National Archives/Official German Photograph) #
(2 of 2) Near Ripent (Champagne). Beginning of construction of defensive measures in a newly-occupied mine crater by German soldiers. (National Archives/Official German Photograph) #
Battery C, Sixth Field Artillery Regiment, 1st Division, from the U.S., in action on the front at Beaumont, France, on September 12, 1918. (AP Photo) #
A British firing squad prepares to execute a German spy somewhere in Great Britain, date unknown. (AP Photo) #
US Army 37-mm gun crew manning their weapon on September 26, 1918 during the World War I Meuse-Argonne (Maas-Argonne) Allied offensive, France. (AP Photo) #
Wounded British prisoner supported by two German soldiers, 1917. (Bibliotheque nationale de France) #
German troops cross a field, ca. 1918. (National Archive/Official German Photograph of WWI) #
Scene at the French town of Barastre during World War I. Shows a bridge over the river Selle, built by New Zealand engineers in 13 hours under shell fire. An ambulance and mounted troops are crossing the bridge. Photograph taken October 31, 1918. (Henry Armytage Sanders/National Library of New Zealand) #
Two Englishmen killed by gas near Kemmel. In April 1918, German forces shelled Armentieres, 15 kilometers south of Kemmel, with mustard gas. (Brett Butterworth) #
Trench position Chemin des Dames, May 1918. Two German soldiers (the closest one wearing a British sergeant's overcoat) move through a temporarily abandoned French trench (occupied by the British), collecting useful items of equipment. Dead English and German soldiers lie in the trench, the area littered with gear and weaponry from both sides. (Brett Butterworth) #
British soldier cleaning a rifle, Western Front. His growth of beard suggests he may have been continuously in the trenches for several days. (National Library of Scotland) #
Royal Air Force planes being loaded with munitions in France. (National Library of Scotland) #
Mother and child wearing gas masks, French countryside, 1918. (Bibliotheque nationale de France) #
Ruins in Reninghe, Belgium, 1916. (Bibliothwque nationale de France) #
Scene in Mons, Belgium when the Canadian army arrived in 1917 shortly before the Battle of Vimy Ridge. Crowds welcomed the Canadian soldiers who were piped through the streets by Canadian pipers. (AP Photo) #
German shells bursting on Canadian positions at Lens, France in June 1917. In the foreground, a Canadian gun pit is camouflaged to avoid destructive enemy fire. (Canadian War Museum) #
German soldiers walk past fallen British soldiers, following heavy street fighting in the village of Moreuil. (Der Weltkrieg im Bild/Upper Austrian Federal State Library) #
German dead on the Somme battlefield. (National Archives) #
Royal Army Medical Corps men search the packs of the British dead for letters and effects to be sent to relatives after the Battle of Guillemont, Somme, France, in September of 1916. (Nationaal Archief) #
Skulls and bones piled in a field during World War I. Photo from a collection by John McGrew, a member of the Photographic Section of the U,S, Army Fifth Corps Air Service, part of the American Expeditionary Forces. (San Diego Air and Space Museum) #
Panoramic view of almost totally destroyed town; crude sign reads, "this was Forges", possibly Forges-les-Eaux. (Library of Congress) #
Dead horses and a broken cart on Menin Road, troops in the distance, Ypres sector, Belgium, in 1917. (National Library of New Zealand) #
A shattered church in the ruins of Neuvilly becomes a temporary shelter for American wounded being treated by the 110th Sanitary Train, 4th Ambulance Corps. France, on September 20, 1918. (NARA/Sgt. J. A. Marshall/U.S. Army) #
2nd Division Pioneers clearing the road near the Cloth Wall Ypres October, 1917. (Frank Hurley/State Library of New South Wales) #
A German machine gunner lies dead at his post in a trench near Hargicourt, in France on September 19th, 1918. From the original caption: "He had courageously fought to the last using his gun with deadly effect against the advancing Australian troops." (State Library of Victoria) #
A French officer stands near a cemetery with recent graves of soldiers killed on the front lines of World War One, at Saint-Jean-sur-Tourbe on the Champagne front, eastern France. (Reuters/Collection Odette Carrez) #
Toward the end of 1918, the Central Powers began to collapse. The Allies had pushed them out of France during the Hundred Days Offensive, and strikes, mutinies and desertion became rampant. An armistice was negotiated, and hostilities ended on November 11, 1918. Months of negotiation followed, leading to a final Peace Treaty. Here, Allied leaders and officials gather in the Hall of Mirrors at the Palace of Versailles for the signing of the peace Treaty of Versailles in France on June 28, 1919. The peace treaty mandate for Germany, negotiated during the Paris Peace Conference in January, is represented by Allied leaders French premier George Clemenceau, standing, center; U.S. President Woodrow Wilson, seated at left; Italian foreign minister Giorgio Sinnino; and British prime minister Lloyd George. (AP Photo) #
Soldiers in a field wave their helmets and cheer on Armistice Day, November 11, 1918, location unknown. (AP Photo) #
Americans in the midst of the celebration on the Grand Boulevard on Armistice Day for World War I in Paris, France, on November 11, 1918. (AP Photo/U.S. Army Signal Corps) #
The announcing of the armistice on November 11, 1918, was the occasion for a monster celebration in Philadelphia, Pennsylvania. Thousands massed on all sides of the replica of the Statue of Liberty on Broad Street, and cheered unceasingly. (NARA) #
The First Battalion of he 308th Infantry, the famous "Lost Battalion" of the 77th Division's Argonne campaign of the Great War, march up New York's Fifth Avenue just past the Arch of Victory during spring of 1919. (AP Photo) #
A Marine kisses a woman during a homecoming parade at the end of World War I, in 1919. (AP Photo) #