how does mitlitary define a casualty war in world war 1?

Answer 1

1. Killed in action.
2. Wounded in action.
3. Died of wounds.
4. Accidental death.
5. Died of illness.
There are public health and military experts which say the growing number in category #5 above is what really stopped the First World War. As the Spanish Influenza pandemic spread through the ranks on both side of the trench lines by leaps and bounds, all the powers involved in the war found themselves with periodic shortages of fit and healthy troops.

Answer 2

A casualty is anyone who becomes unfit for service for any reason - they might be wounded or killed, or suffer disease or an accident.

They are usually split into battle casualties and non-battle casualties.

Battle casualties are those wounded and killed by enemy action on the battlefield. Non battle casualties include all cases of sickness and accidental injuries, and also any injuries to prisoners.

A single person could be counted more than once as a casualty if they were wounded or sick on more than one occasion during a campaign.

Sickness could cause a large proportion of casualties - for example of the 213,000 British casualties at Gallipoli in 1915, fully 145,000 were due to sickness. However this rate was much lower than in previous wars, where disease could cause as many as 90% of casualties.

Answer 3

Have you taken a look at Wikipedia for this? I typed in "casualty of war in WWI" & ended up with a chart by country & military death, civilian death & wounded. Article also talks a bit about how & why people died/were killed.

Of course you have to take everything from Wikipedia with a grain of salt or two since it's a public forum - anyone can add to an answer