Jan Fischer, American Soldier In His Military Life

The meaning of military tactics has changed over time from the deployment and manoeuvreing of entire land armies on the fields of ancient battles, and galley fleets, to modern use of small unit ambushes, encirclements, bomb and bombardment attacks, frontal assaults, air assaults, hit-and-run tactics used mainly by guerrilla forces and, in some cases, suicide attacks on land and at sea. Evolution of aerial warfare introduced its own air combat tactics. Often, military deception, in the form of military camouflage or misdirection using decoys, is used to confuse the enemy as a tactic.
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.