Second, a famous example of PD comes from the trench-warfare of World War I [ 1], in which opposing lines of troops preferred to cooperate in maintaining a local peace rather than risk death in mutual defection (and reversion to reciprocated attacks).
The trench warfare of World War I still lay generations in the future.
Roy was a Captain in psychological warfare in World War II.
The company made mustard gas, a toxic blistering agent used in chemical warfare, during World War I.
The ferocious yearlong siege of Sevastopol "was a precursor of the industrialized trench warfare" of World War I.
The protracted trench warfare of World War I called upon all of the traditional siegecraft skills of the military engineers.
Relatively little use was made of trenches in the mobile warfare of World War II in Europe.
Jascha Heifetz played on an aluminum violin with a fiberglass bow to entertain American troops engaged in jungle warfare during World War II.
Submarines first became a major factor in naval warfare during World War I (1914 18), when Germany employed them to destroy surface merchant vessels.
