The British in WW1. A little known fact is that Henry Ford designed and built tanks.
Germany
The first use of tanks in warfare
There is no information on where, when and who created the first rainwater tanks. Rainwater tanks have been used for centuries as a way to collect rain water and then use it for drinking, bathing, and cleaning.
Yes, the first use was about twenty years earlier in WW1 tanks were used extensively
Yes, Great Britain has the first to use them.
Yes, Tanks Were First Used During The Battle Of Somme (1st July 1916 - 18th November 1916) By The Allies.
Great Britain
WWI tanks certainly weren't anything modern by today's standards. Even by the mid-1920s, they were obsolete. But the British were the first to use tanks, and the French were the first to use a turret mounted gun.
It was the first war where tanks were used against other tanks. This caused huge changes in the way tanks were built and in the strategy of their use. This first became really obvious in the battles of Kasserine Pass in Tunisia in 1943 when the US 1st Armoured div was virtually destroyed by Afrika Korps tactics.
The first army to use the Kalemegdan war tanks was the Serbian army during World War I. These tanks were part of Serbia's efforts to modernize its military capabilities in response to the challenges posed by the war. The Kalemegdan tanks were named after the historic Kalemegdan Fortress in Belgrade, symbolizing their significance in Serbian military history.
The first successful use of tanks was the Battle of Cambrai (20th November-3rd December 1917). It demonstrated that the Hindenburg Line could be penetrated. Cambrai was aslo a supply point for part of the Hindenburg Line.
Austria and Turkey did not use tanks. Germany built only twenty tanks, and they used captured British tanks which were in no short supply.