Short answers, pulled from the story.
Austrian field marshal Karl Philipp, Prince of Schwarzenberg commanded nearly 150,000 Allied troops against Napoleon's half that number. Blücher led a separate force of 53,000 soldiers moving northwest toward Paris while Schwarzenberg remained with the main army.
The French Imperial Guard artillery opened fire on the east end of the Chemin des Dames ridge at 9:00 am on the 6th of March 1814. The battle concluded by day's end when the French held the battlefield but failed to achieve their strategic objectives.
The engagement occurred along the Chemin des Dames ridge near Reims and Berry-au-Bac as Napoleon attempted to reach Laon. The fighting involved positions extending from Corbeny northward toward Soissons where Marmont and Mortier had previously tried to capture the city.
One historian stated that the Russians lost 5,000 men while the French counted 5,500 casualties. A second authority placed French casualties between 5,400 and 8,000 while Russian sources admitted losing 4,785 killed wounded and missing.
Craonne was a Pyrrhic victory because the French held the battlefield at the day's end but their other objectives were not attained. Napoleon hoped to march rapidly to Laon ahead of Blücher but instead found his army spread out toward Soissons rather than cutting off the Allied retreat.