The Great War set fire to Europe and spun the wheels of World War II. How much do you know about World War I battles?
In February of 1916, Germany's 5th Army began an offensive against the French. The Battle of Verdun lasted for more than 9 agonizing months.
The Battle of Verdun was a disheartening meatgrinder, causing 70,000 casualties per month. Some estimates show that roughly half a million soldiers -- on each side -- were killed during the ordeal.
Several French forts in the Verdun area fell to German forces, but Verdun itself held strong. By the end of 1916, French forces retook most of the fortifications that the Germans stormed.
At the First Battle of the Marne, the Allies began using aircraft to spy on enemy lines. That information helped the Allies find parts of the German lines that were vulnerable to attack.
More than 2 million men fought in the First Battle of the Marne. In total, both sides suffered more than half a million casualties.
During the Battle of the Ardennes, French and German armies clashed in a heavily wooded area. The Germans dug in and beat back the French, managing to secure a victory along with iron resources to assist their war efforts.
The British brought hundreds of tanks to a trench fight, astonishing the Germans with their newfangled machines. The tanks smashed barbed wire and cleared paths for infantry to advance.
Germany pushed deep into France during the Battle of the Frontiers, which was actually a series of battles fought along the Western Front.
An effective German attack destroyed most of the Russian Second Army at the Battle of Tannenberg. The Germans used rail lines to quickly move troops and supplies around the battle front.
Plan 17 included several actions to guide French forces in the event of a German invasion. The plan led to the Battle of the Frontiers, which resulted in heavy French losses and a Germany victory.
The Battle of Charleroi lasted about three days. The Germans pushed the French army back over and over again in this time period and got within sight of Paris.
At the Battle of Messines, the British Second Army started an offensive that eventually helped them to retake territory captured by the Germans.
More than 1 million men died in the first year of fighting. As casualties mounted, the entire world reeled at the immense carnage caused by modern weapons.
The Battle of the Somme had a 15-mile front. For five months, French and British forces fought the Germans in one of the bloodiest battles in history.
The British attacked the Germans with artillery for seven days, all for naught. The Germans stayed safe in their trenches and when the British infantry advanced, they mowed them down.
More than 19,000 British soldiers died on the first day of the Battle of the Somme. The British carried more than 57,000 casualties on just the first day.
The Battle of Jutland was the biggest naval battle of World War I. By the end of the battle, nearly 10,000 sailors had lost their lives.
The Retreat from Mons is also called the Great Retreat, as Allied forces fell back from the Western Front after being defeated at the Battle of Charleroi.
About 250 ships clashed during the Battle of Jutland. At the end of the battle, the British navy had pushed back the Germans and established a blockade that would ultimately help the Allies win the war.
There were three major Battles of Ypres during World War I. In the third battle alone, both sides absorbed hundreds of thousands of casualties.
The Battle of Caporetto was a horrific defeat for the Italians. More than 260,000 were captured and 350,000 were missing by the time the dust settled.
The First Battle of the Marne was a decisive victory for the Allies, helping to stop the Germans from entering Paris.
The Battle of Verdun was the longest of the war, lasting from February to December of 1916. Although the Allies won, they lost hundreds of thousands of troops in the process.
The Second Battle of Artois began in May and lasted through mid-June in 1915.
The U.S. wasn't part of the Second Battle of Artois. France, along with the British Empire, attacked the Germans and suffered heavy casualties during the battle.
The First Battle of Ypres was a month-long engagement at the end of 1914. The second battle didn't begin until April of the next year.
The Germans used the battle to test chlorine gas, which worked very well, killing thousands of Allied troops and sending survivors scurrying in a panicked retreat.
The First Battle of the Aisne found the Germans halting a retreat to face the Allied forces chasing them across France. In the end, neither side could claim victory.
The British released chlorine gas against the Germans at the Battle of Loos. The plan backfired at times, as the wind blew the gas back into British lines in some places.
The Battle of Amiens occurred in August 1918. The Allies pushed back the Germans by more than 7 miles in a single day, helping to create momentum that eventually led to an Allied victory in the war.