.The section “From Mules to Motors” opens with the following lines: “When the war broke out, in 1914, many countries still used outdated methods of fighting. Some armies even sent their soldiers into battle on horseback carrying spears.”

Trench warfare is a type of land warfare using occupied fighting lines largely comprising ... On the Western Front in 1914–1918, both sides constructed elaborate trench, ... In early modern warfare troops used field works to block possible lines of advance. ... Grand battles with the old maneuvers were out of the question.

Explanation: