In 1914-1918 military aviation evolved from a novelty to an essential combat arm including
reconnaissance, air superiority, tactical support of ground operations, and strategic bombing.

Unproven in 1914, submarines almost became the decisive weapon of the Great War as
Germany countered the Royal Navy’s blockade with its near-successful U-boat campaign
against the shipping that supplied Britain.

The armored, caterpillar-tractioned fighting vehicle was developed in World War I to
break the trench warfare stalemate, and was first used in 1916’s Battle of the Somme.