100: After retreating at the Battle of the Marne, Germans dug in, creating this type of warfare.
Answer: What is trench warfare?
A constant danger to feet, this disease was caused by standing in cold, wet, mud-filled trenches.
Although used earlier, this type of gas was notoriously released by Germany at Ypres in 1915.
The arrival of millions of troops from this country in 1917–18 helped turn the tide for the Allies.
This 1914 plan was Germany’s blueprint for a quick victory by invading neutral Belgium to reach France.
This 1916 battle, lasting nearly 10 months, was designed to "bleed the French Army white".
The dangerous, open area between opposing trench lines was known as this.
This weapon caused the highest number of casualties on the Western Front, leading to massive troop losses.
This final German offensive in 1918 was an all-or-nothing attempt to win before American strength peaked.
This 1914 battle stopped the German advance near Paris and led to the "Race to the Sea."
This five-month-long 1916 battle aimed to relieve pressure on Verdun and featured the first use of tanks.
This psychological condition caused by the relentless stress of artillery bombardment was known as this.
First introduced by the British at the Somme, this weapon was designed to break the stalemate of trench warfare.
The Allied counter-offensive that broke the German lines is known by this numerical name.
This German plan intended to bypass French border defenses by invading through neutral Belgium.
Soldiers used this common, foul-smelling substance, sometimes whale oil, to prevent trench foot.
This vehicle was used extensively for reconnaissance, but later for aerial combat and bombing.
This agreement, signed in a railway carriage in Compiègne, ended the fighting on Nov 11, 1918.
In 1916, this "meat grinder" battle lasted ten months and became a symbol of French determination.
Nicknamed the "Race to the Sea," this 1914 battle saw both sides attempting to outflank each other to the coast.
This was the term for the daily morning/evening alertness drill soldiers performed in the trenches.
This type of defensive barrier, often several rows deep, was built in front of trenches to stop infantry charges.
This German general and his partner Hindenburg effectively ran the country as a military dictatorship by 1917.
This British General, nicknamed "The Butcher," commanded the BEF during the Somme and Passchendaele.