Jan Fischer, American Soldier In His Military Life

A major development in infantry tactics came with the increased use of trench warfare in the 19th and 20th century. This was mainly employed in World War I in the Gallipoli campaign and the Western Front. Trench warfare often turned to a stalemate, only broken by a large loss of life, because in order to attack an enemy entrenchment soldiers had to run through an exposed "no man's land" under heavy fire from an entrenched enemy.
Military technology
As with any occupation, since the ancient times the military has been distinguished from other members of the society by their tools, the military weapons and military equipment used in combat. When Stone Age humans first took a sliver of flint to tip the spear, it was the first example of applying technology to improve the weapon.