Asked by ykme
What events had led up to the First Battle of the Marne?
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Short answer: a chain of political crises, mobilizations and early Western Front battles in August 1914 — driven by the assassination of Archduke Franz Ferdinand, the July Crisis and the implementation of the German Schlieffen Plan — produced the rapid German advance through Belgium and northern France, the Allied “Great Retreat,” and the operational overreach and gap in the German line that made the Allied counter‑attack at the Marne possible.
More detail (chronological and causal highlights)
- Assassination and the July Crisis (June–July 1914)
- 28 June 1914: Archduke Franz Ferdinand of Austria is assassinated in Sarajevo.
- July 1914: Austria-Hungary issues an ultimatum to Serbia; the diplomatic crisis triggers mobilizations and declarations of war across the alliance systems.
- Declarations of war and general mobilization (late July–early August 1914)
- Austria-Hungary declares war on Serbia (28 July).
- Russia mobilizes to help Serbia; Germany declares war on Russia (1 Aug) and on France (3 Aug).
- Germany demands free passage through Belgium; when Belgium refuses, Germany invades (4 Aug). Britain declares war on Germany (4 Aug) in part because of Belgian neutrality (Treaty of London, 1839).
- Strategy and plans in place
- Germany implements a version of the Schlieffen Plan: a rapid sweep through Belgium and northern France to encircle and defeat the French army quickly in the west before turning east against Russia.
- France puts Plan XVII into effect — an offensive to recover Alsace-Lorraine — but this is secondary to the main German thrust through Belgium.
- Early fighting in Belgium and northern France (early–late August)
- Belgian resistance (notably at Liège, 5–16 Aug) delays but does not stop the German advance; delays help the Allies buy time.
- The British Expeditionary Force (BEF) and French armies move north to meet the German right wing. Skirmishes and battles follow: Battle of Mons (23 Aug), Battle of the Frontiers (mid to late August), including clashes at Charleroi, the Ardennes and Lorraine.
- The Allies are pushed back in a series of defeats and begin the “Great Retreat” southward and westward.
- Operational developments and German overreach (late August–early September)
- The German right wing (under the commanders Paul von Hindenburg’s subordinates; principal field commanders included Generals von Kluck and von Bülow on the northern wing) pushes rapidly down the Marne valley toward Paris but extends and strains its supply lines.
- German Chief of the General Staff Helmuth von Moltke’s modifications to the original Schlieffen plan and the realities of fighting leave the German right flank farther east than planned, and a gap develops between the German center/left and the right wing.
- French commander-in-chief Joseph Joffre reorganizes the French armies during the retreat, moves troops (including those ferried by rail and later by Parisian taxis) to form a new left-flank army around Paris (Sixth Army under Maunoury), while the BEF continues to cooperate with French forces.
- Immediate prelude
- By 5 September 1914 German forces had approached within striking distance of Paris but were exhausted and somewhat separated. Allied command detected a vulnerable gap between the advancing German armies.
- Joffre orders a counter-attack to exploit that gap; Allied forces (French and British) move to strike the exposed German right and interior lines — this action launches the First Battle of the Marne (6–12 September 1914).
In short: diplomatic crisis → general European war → German Schlieffen sweep through Belgium → Allied defeats and retreat → German advance toward Paris that overextended and exposed a flank → Allied reorganization and counter-attack at the Marne.
More detail (chronological and causal highlights)
- Assassination and the July Crisis (June–July 1914)
- 28 June 1914: Archduke Franz Ferdinand of Austria is assassinated in Sarajevo.
- July 1914: Austria-Hungary issues an ultimatum to Serbia; the diplomatic crisis triggers mobilizations and declarations of war across the alliance systems.
- Declarations of war and general mobilization (late July–early August 1914)
- Austria-Hungary declares war on Serbia (28 July).
- Russia mobilizes to help Serbia; Germany declares war on Russia (1 Aug) and on France (3 Aug).
- Germany demands free passage through Belgium; when Belgium refuses, Germany invades (4 Aug). Britain declares war on Germany (4 Aug) in part because of Belgian neutrality (Treaty of London, 1839).
- Strategy and plans in place
- Germany implements a version of the Schlieffen Plan: a rapid sweep through Belgium and northern France to encircle and defeat the French army quickly in the west before turning east against Russia.
- France puts Plan XVII into effect — an offensive to recover Alsace-Lorraine — but this is secondary to the main German thrust through Belgium.
- Early fighting in Belgium and northern France (early–late August)
- Belgian resistance (notably at Liège, 5–16 Aug) delays but does not stop the German advance; delays help the Allies buy time.
- The British Expeditionary Force (BEF) and French armies move north to meet the German right wing. Skirmishes and battles follow: Battle of Mons (23 Aug), Battle of the Frontiers (mid to late August), including clashes at Charleroi, the Ardennes and Lorraine.
- The Allies are pushed back in a series of defeats and begin the “Great Retreat” southward and westward.
- Operational developments and German overreach (late August–early September)
- The German right wing (under the commanders Paul von Hindenburg’s subordinates; principal field commanders included Generals von Kluck and von Bülow on the northern wing) pushes rapidly down the Marne valley toward Paris but extends and strains its supply lines.
- German Chief of the General Staff Helmuth von Moltke’s modifications to the original Schlieffen plan and the realities of fighting leave the German right flank farther east than planned, and a gap develops between the German center/left and the right wing.
- French commander-in-chief Joseph Joffre reorganizes the French armies during the retreat, moves troops (including those ferried by rail and later by Parisian taxis) to form a new left-flank army around Paris (Sixth Army under Maunoury), while the BEF continues to cooperate with French forces.
- Immediate prelude
- By 5 September 1914 German forces had approached within striking distance of Paris but were exhausted and somewhat separated. Allied command detected a vulnerable gap between the advancing German armies.
- Joffre orders a counter-attack to exploit that gap; Allied forces (French and British) move to strike the exposed German right and interior lines — this action launches the First Battle of the Marne (6–12 September 1914).
In short: diplomatic crisis → general European war → German Schlieffen sweep through Belgium → Allied defeats and retreat → German advance toward Paris that overextended and exposed a flank → Allied reorganization and counter-attack at the Marne.
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