sentences:  Pétain led his brigade at the Battle of Guise (29 August 1914).At the end of August 1914 he was quickly promoted to brigadier-general and given command of the 6th Division in time for the First Battle of the Marne; little over a month later, in October 1914, he was promoted yet again and became XXXIII Corps commander.After leading his corps in the spring 1915 Artois Offensive, in July 1915 he was given command of the Second Army, which he led in the Champagne Offensive that autumn.