Which revolutionary military technology product was first deployed on a large scale by the British Army at the Battle of the Somme in 1916?

Throughout military history, certain product innovations have revolutionized warfare and shifted the balance of power. From ancient times to modern conflicts, technological breakthroughs in military equipment have often determined battlefield outcomes. This poll tests your knowledge about one of the most significant military product innovations that transformed combat tactics during World War I. Can you identify which groundbreaking military technology was first deployed en masse at the Battle of the Somme in 1916?

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The tank (specifically the Mark I 'Mother' tank)
Poison gas artillery shells
Aircraft carriers
Flamethrower units