World War I: Causes, Battles, and Trench Warfare

Posted on May 6, 2026 in History

The Assassination of Archduke Franz Ferdinand

  • Killed in Sarajevo: 28 June 1914
  • Perpetrator: Gavrilo Princip

This event triggered the July Crisis.

July Crisis Timeline

  • 28 July: Austria-Hungary declares war on Serbia
  • 30 July: Russia mobilises
  • 1 August: Germany declares war on Russia
  • 3 August: Germany declares war on France
  • Britain enters: Following the German invasion of Belgium

The Schlieffen Plan

The German strategy to defeat France quickly before turning to Russia.

Goal

A rapid victory on the Western Front followed by the Eastern Front.

Reasons for Failure

  • Belgian resistance
  • British intervention
  • German communication failures
  • French military resilience
  • The onset of trench warfare

Important Battles

Second Battle of Ypres

  • First major use of chlorine gas by German forces.

Battle of the Somme (July–November 1916)

  • Context: Fought on the Western Front to break German lines and relieve pressure on Verdun.
  • The Plan: General Haig ordered a week of artillery bombardment followed by an infantry advance.
  • Reality: Bombardment failed to destroy barbed wire or German dugouts; machine guns caused massive casualties.
  • Outcome: 60,000 British casualties on the first day; total losses exceeded 1 million across all sides.
  • Legacy: Often viewed as a failure, though it weakened the German army and introduced new tactics, including limited use of tanks.

Key Figures

  • Kaiser Wilhelm II: Expanded German military power.
  • Lord Kitchener: Led the British recruitment campaign.
  • Douglas Haig: Commander during the Battle of the Somme.
  • Archduke Franz Ferdinand: His assassination sparked the conflict.

Causes of World War I (M.A.I.N.)

M — Militarism

  • Arms race between major powers.
  • Kaiser Wilhelm II expanded the German military.
  • Naval competition between Britain and Germany (e.g., HMS Dreadnought).

A — Alliances

  • Triple Alliance (1882): Germany, Austria-Hungary, Italy.
  • Triple Entente (1907): Britain, France, Russia.
  • Significance: Local conflicts could escalate into global war.

I — Imperialism

  • Global competition for colonies and resources created deep-seated rivalries.

N — Nationalism

  • Intense national pride and desire for self-determination, particularly in the Balkans.

Trench Warfare

Structure

  • Lines: Front line, support, and reserve trenches connected by communication trenches.
  • Design: Built in zigzags to contain blast damage.

Conditions and Challenges

  • Environment: Mud, constant rain, and flooding.
  • Health: Trench foot, disease, lice, and trench fever.
  • Hazards: Rats, constant shelling, snipers, and poison gas.
  • Daily Life: Sentry duty, weapon maintenance, and limited rations (bully beef, hard biscuits).

Gas Protection

  • Evolution from improvised urine-soaked cloths to standardized gas masks.

Recruitment and Conscription

  • Recruitment: Volunteers driven by propaganda and patriotism.
  • Conscription: Forced military service introduced in Britain in 1916.