Trench warfare became the defining feature of the Western Front, with both sides digging extensive networks of trenches, dugouts, and fortifications to protect their troops from enemy fire.

The Schlieffen Plan aimed to achieve a decisive victory against France within a matter of weeks, before Russia could fully mobilize its vast army and pose a threat to Germany on the Eastern Front.

The introduction of tanks, particularly the British Mark I tank, provided a means to overcome the defensive advantages of trench warfare, allowing troops to advance across no man's land and break through enemy lines.

Operation Spring Offensive, also known as the Kaiserschlacht or Ludendorff Offensive, was a massive German offensive launched in March 1918 in an attempt to break through Allied lines and force a negotiated peace before the arrival of American reinforcements.

Germany was the first country to use poison gas as a weapon during World War I, employing chlorine gas against Allied troops at the Battle of Ypres in April 1915. This marked a significant escalation in the use of chemical weapons in warfare.

The primary role of fighter aircraft during World War I was to engage in aerial combat with enemy aircraft, seeking to gain air superiority and prevent enemy aircraft from carrying out their missions.

Germany's unrestricted submarine warfare policy, initiated in 1917, involved sinking merchant ships without warning, regardless of their nationality, in an attempt to cut off supplies to Britain and its allies.

The Hundred Days Offensive, launched by the Allied forces in August 1918, was a series of successful offensives that pushed back German forces and led to the signing of an armistice in November 1918, effectively ending World War I.

Britain was the first country to develop and use tanks during World War I. The first tanks, known as Mark I tanks, were deployed in September 1916 at the Battle of the Somme.

Blitzkrieg, also known as lightning war, was a German military strategy that emphasized rapid movement, surprise attacks, and the use of combined arms to achieve quick and decisive victories.

Britain was the first country to develop and use aircraft carriers during World War I. The first aircraft carrier, HMS Ark Royal, was commissioned in 1914 and played a significant role in the Battle of Jutland in 1916.

The Treaty of Versailles, signed on June 28, 1919, officially ended World War I between Germany and the Allied Powers. The treaty imposed harsh conditions on Germany, including territorial losses, reparations payments, and military restrictions.

Russia suffered the most casualties during World War I, with an estimated 1.7 million soldiers killed and 4.9 million wounded.

The Grand Fleet Blockade, also known as the North Sea Blockade, was a naval blockade imposed by the British Royal Navy on Germany during World War I. The blockade aimed to cut off Germany's access to vital supplies and raw materials.

Germany developed and used the first long-range bombers during World War I. The Gotha G.IV bomber, introduced in 1917, was capable of reaching targets deep within enemy territory.