the Germans :)
The first country to use the tank was the inventors, the British, in world war one, though during the war the french and Germans made designs too
Germany was the first country to use gas, chlorine in particular, in world war one. it was first used against British and French units in the first battle of Ypres.
The first ambulance was used in the American Civil War.
China.
Germany was the first country to use chemical weapons during World War I, employing chlorine gas against Allied troops in April 1915.
GERMANY
If we are talking about World War One and the side of the US, Japan made the first attack, launching the country into the war. It was they error as it brought total destruction for the Japanese.
Who was the first two opposite country in war
Germany used the Grenade first in WW1 So germany was the first county to use the grenade
The first country to use submarines in World War I was Germany. They deployed their U-boats (Unterseeboote) to engage Allied shipping and naval forces, significantly impacting naval warfare during the conflict. The use of unrestricted submarine warfare by Germany was a key factor in drawing the United States into the war in 1917.
The first use of gas in a war was used in world war one.