Germany
Russia
When World War I broke out in 1914, the Russian Empire had the world's largest standing army, with approximately 1400000 soldiers on active duty
Russia
Russia
Not a simple answer. Russia was the largest Allied country, population, & army when WW1 started, however it collapsed because of the 1917 Communist Revolution, and German victories. It was defeated before the war ended. The United States was the largest Allied country & population when the war ended, however the large US Army was not yet fully mobilized and in France to fight when the war ended. France was the Allied country with the largest army in the war zone when the war ended. Great Britain was the Allied country with largest navy, the United States had the second largest navy (not all in the war zone).
During World War I, the country with the largest army was Russia. At the start of the war, Russia mobilized millions of soldiers as part of its Imperial Army, reaching over 12 million troops throughout the conflict. However, the size of the army was not always matched by effective logistics and command, leading to significant challenges on the battlefield. Ultimately, the vast manpower played a crucial role in the war's dynamics, especially on the Eastern Front.
GermanyRussia was the European power with the largest army at the outbreak of World War 1. Boasting an army of twelve million. It had a million more than Germany, who came in second.
The largest ARMY was the Union, in America. The largest MILITARY force was Britain, mainly because of it's navy.
During World War I, Russia had the largest army in terms of manpower. At the start of the war, the Russian Imperial Army mobilized millions of soldiers, significantly outnumbering other major powers. However, despite its size, the army faced challenges such as logistical difficulties and poor leadership, which ultimately affected its effectiveness on the battlefield.
The largest "Army" of World War 2 was the Allied Force sent on D-Day (Invasion of Normandy) and the other largest army was the Russian forces that went against the Nazis. Japan had a huge force too but a large majority of them were killed on the islands and in sunken ships.
None. There was no Irish Army during the First World War, as Ireland was not yet an independent country.