The Battle of Verdun. It was in northern France, the city of Verdun-sur-Meuse and it was fought from February 21 to December 18 1916.
If you're referring to Gallipoli in the context of the (in)famous battle then the answer is no. That fight occurred during WWI and the helicopter was not a practical machine at the time.
There were many but the most famous two are The Battle of Somme and The Battle of Beallou Wood
The Battle of the Somme took place n WWI.
somme
Battle (Date)(victor) Battle of Waterloo (1815)(England and Dutch-Belgian troops) , the Battles of Ypres (WWI) (depends which battle), the Battle for Liège (1914 and 1940) (Germany), the Battle for the Yser river (Belgium), the Battle of the Golden Spurs (1302) (Flanders and Namur), the Battle of the Silver Helmets (1914) (Belgium), the Battle for Namur (1914 and 1940) (Germany) the Battle for Brussels (1830) (Belgium) ...
This was a battle in Turkey during WWI.
Yes, the larger "conflict" was WWI.
July 1 to November 18, 1916 during WWI.
Deadliest battle America has been involved in to date was the Battle of Meuse-Argonne in WWI (26,277 deaths) Deadliest battle on American soil was Gettysburg in US Civil War (7,863)
Famous flightier pilot of WWI Nd repeatedly fought in the dreaded "Flying Circus." He was engaged with 134 battles and downed 26 enemy aircrafts, giving him the 'American ace of aces" award
It was given to marines in WWI by the Germans for their ferocity in battle.
Western, the had the Battle of Verdun and Somme which were the worst battles of WWI.