For many years serious students of the First World War have lacked a detailed English-language guide to the French Army. Apart from the British guide to the French army that was published in 1914, no such guide has been produced. In this comprehensive study, the authors seek to fill this gap through the provision of detailed information on the infantry and cavalry divisions of the French Army. The French Army expanded from 43 active infantry divisions, and 10 cavalry divisions, in 1914 to a total of 140 divisions of infantry, and to 12 of either mounted or dismounted cavalry. The vast majority of these formations served on the Western Front in defence of France itself. Coverage includes a listing of those divisions of the Allied armies, British, American and Italian, serving under French command at various times. For each division, the authors provide a full listing of all the constituent components, whether they were infantry, artillery, cavalry or engineers. This will enable readers to reconstruct the composition of each division on any given date. In addition to a list of commanders, a detailed narrative of its operational history is provided. This full treatment of the divisions is complemented by a series of detailed lists of all the metropolitan and colonial regiments from which the divisions drew their manpower. These lists cover infantry, artillery, cavalry and engineers. The large number of regiments raised and employed operationally precludes coverage as detailed as that provided for the divisions, nevertheless, a much useful data is provided. In the second part of the study the authors build on the coverage of divisions and regiments, providing a detailed history of higher formations of the French Army: the army groups, armies and army corps. It is rare to find adequate coverage of such formations for any of the armies of the First World War. The authors hope to remedy this neglect. The higher direction of military operations, especially on the Western Front, was conducted through these three levels of command, which linked the commander-in-chief to the front line divisions and regiments under his command. The French army, at various times, employed four army groups on the Western Front. In addition, it formed 10 armies, a variety of temporary army-level detachments, and 36 corps, plus various temporary corps-level commands. The coverage of each higher formation includes information on leaders, troops under direct command, and a narrative history, which includes all divisions assigned to the relevant headquarters. From this information the reader can reconstruct the French order of battle for any given date between August 1914 and November 1918. After an alphabetical listing of French generals, the authors provide an extensive series of orders of battle which includes both overviews of the entire Western Front, such as 11th November 1918, and of individual battles and campaigns such as Verdun in 1916. This coverage includes the French contributions to the Allied cause in Gallipoli, Salonika and Italy. The book concludes with a guest contribution from Peter Abbott, who provides an overview of the contribution of those forces raised in the French colonies. Pour la France is destined to become a landmark First World War reference work.