Renault AG1 Taxi de Marne from 1914, two cylinders, 8 HP, 1205 cc, 3 speeds + rear, 40 km/h

The Renault Type AG, commonly referred to as the Renault Taxi de la Marne or Marne Taxi is a hackney carriage automobile manufactured by the French automaker Renault from 1905 to 1910. The name Taxi de la Marne was not used until the outbreak of World War I, when the fleet of Paris taxis was requisitioned by the French Army to transport troops from Paris to the First Battle of the Marne in early September 1914.

The First Battle of the Marne was a battle of the First World War fought from 5 to 12 September 1914. The German army invaded France with a plan for winning the war in 40 days by occupying Paris and destroying the French and British armies. The Germans had initial successes in August. They were victorious in the Battles of Mons and the Frontiers and over ran a large area of northern France and Belgium. In what is called the Great Retreat the Germans pursued the retreating Franco/British forces more than 250 km (160 mi) southward. The French and British halted their retreat in the Marne River valley while the Germans advanced to 40 km (25 mi) from downtown Paris.

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