The above three corps faced the left of the German I Army. _10th Corps_ (General Defforges). II ARMY (General von BÜLOW), (H.Q., Montmirail). 19th and 20th Divisions (Generals Bonnier and Rogerie) east of _VII Corps Active_ (General Esternay. Sent to aid of 9th Army von Einem), (XIII and XIV from September 9 to 11. Divisions). The above four corps extended This had come on tardily, over the plateaux from the and was in the rear, British right to the Paris–Nancy between Château-Thierry highroad, midway between Esternay and Montmirail, when the and Sézanne, their right being battle opened. Being advanced. behind Kluck’s left, it has sometimes been counted _4th Group of Reserve Divisions_ as part of the I Army and (General Valabrègue). the IX as part of Bülow’s. The VII Reserve Corps was Consisting of the 51st, 53rd, detained before Maubeuge, and 69th Divisions of Reserve and only reached the Aisne (Generals Bouttegourd, Perruchon, on September 13. and Legros). In support and reserve: much fatigued after the _X Corps Reserve_ (General battle of Guise and the retreat. von Hülsen).