You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "which country has the most casualties in ww1?" whose answer is Russian Empire.
Each document should contain about 30 words, and these documents should contain useful information.

Query: casualties in World War I by country
Useful Output:

Doc 1: Casualties in World War I ; Austria-Hungary, 7,800,000, 1,200,000, 3,620,000, 2,200,000 ; Belgium, 267,000, 13,716, 44,686, 34,659
Doc 2: It has been estimated that the number of civilian deaths attributable to the war was higher than the military casualties, or around 13,000,000.
Doc 3: According to the First World War page on the Australian War Memorial website from a population of fewer than five million, 416,809 men enlisted,
Doc 4: 24 Hrs In The Trenches (WW1 Documentary). Battle Guide•1.1M views · 10:21. Go to channel · What Every Country in the World is Best At (Part 2).
Doc 5: World War One – Statistics ; Allied Countries - Losses: Military Casualties: 5.7 million ; **NOTE: Romania, Belgium, Montenegro and Portugal were “Neutral