Setbacks the Allies suffered in 1917 and 1918?

In 1917 and 1918, the Allies faced several significant setbacks, including the Russian Revolution, which led to Russia's withdrawal from World War I and the subsequent Treaty of Brest-Litovsk, allowing Germany to shift its focus to the Western Front. The Allies also struggled with resource shortages and troop morale, particularly evident during the disastrous Nivelle Offensive in April 1917, which resulted in heavy casualties and widespread mutinies among French troops. Additionally, the German Spring Offensive in 1918 initially caught the Allies off guard, leading to significant territorial losses before the Allies eventually regrouped and counterattacked. These challenges put immense pressure on the Allied forces but ultimately set the stage for their eventual victory later in 1918.