Short answers, pulled from the story.
The Russian forces under Pahlen retreated from Mormant after facing an overwhelming French attack at dawn. The French infantry advanced with Duhesme's division on the left and Gérard's reserve in the center while cavalry units engaged the Russian horsemen.
Pahlen commanded the Russian corps that faced Napoleon's forces near Champaubert and Montmirail before engaging at Mormant. His command included Selenginsk, Reval, Tenguinsk and Estonia Regiments plus the 4th and 34th Jäger Regiments along with cavalry led by Theodor von Rüdiger.
Digby Smith gave casualties for the actions as 600 French and 3,114 Allied, with the French seizing 9 guns and 40 caissons. Another authority stated that Pahlen lost 2,000 men and 10 guns while George Nafziger estimated the Allies lost 3,000 men and 14 guns combined with Valjouan.
The Battle of Montereau was fought on the 18th of February following the events at Mormant on the 17th of February. Napoleon expected Victor to be at Montereau at 6:00 a.m. the next day but replaced him when he arrived at 9:00 a.m.
French forces included Guillaume Philibert Duhesme's II Corps division on the left and Étienne Maurice Gérard's Paris Reserve forming the center. Louis Huguet-Château's II Corps division took the right flank while cavalry units were led by Milhaud, Kellermann, Piré, Briche, Lhéritier and Trelliard.