Trench warfare
Trench warfare prevailed on the Western Front from late 1914 until the Germans launched their Spring Offensive on 21 March 1918. After the buildup of forces in 1915, the Western Front became a stalemated struggle between equals, to be decided by attrition. Frontal assaults, and their associated casualties, became inevitable because the continuous trench lines had no open flanks. Casualties of the defenders matched those of the attackers, as vast reserves were expended in costly counter-attacks or exposed to the attacker's massed artillery. There were periods in which rigid trench warfare broke down, such as during the Battle of the Somme, but the lines never moved very far. The war would be won by the side that was able to commit the last reserves to the Western Front.
The Guns of August
Throughout the aforementioned narrative, Tuchman constantly brings up a theme: the numerous misconceptions, miscalculations, and mistakes that she believed resulted in the tragedy of trench warfare, such as:Overall, Tuchman argues that while some of the war's major combatants looked forward to a war, specifically Germany and Austria-Hungary, all of them expected it to be a short one, and none of them desired or anticipated a prolonged war. Likewise, she argues that even successes, such as the First Battle of the Marne, a French victory, were to some extent accidental victories that were won despite, and not because of, military leadership or strategy.