Question: Who's men halted the Russian assult and permitted Murat to send two cuirassier divisions?
About the article "Battle of Austerlitz", section "Endgame".

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Meanwhile, the northernmost part of the battlefield was also witnessing heavy fighting.
Prince Liechtenstein's heavy cavalry began to assault Kellerman's lighter cavalry forces after eventually arriving at the correct position in the field.
The fighting initially went well for the French, but Kellerman's forces took cover behind General Caffarelli's infantry division once it became clear Russian numbers were too great.
Caffarelli's men halted the Russian assaults and permitted Murat to send two cuirassier divisions (one commanded by d'Hautpoul and the other one by Nansouty) into the fray to finish off the Russian cavalry for good.
The ensuing mêlée was bitter and long, but the French ultimately prevailed.
Lannes then led his V Corps against Bagration's men and after hard fighting managed to drive the skilled Russian commander off the field.
He wanted to pursue, but Murat, who was in control of this sector in the battlefield, was against the idea.
Napoleon's focus now shifted towards the southern end of the battlefield where the French and the Allies were still fighting over Sokolnitz and Telnitz.
In an effective double-pronged assault, St. Hilaire's division and part of Davout's III Corps smashed through the enemy at Sokolnitz and persuaded the commanders of the first two columns, Generals Kienmayer and Langeron, to flee as fast as they could.
Buxhowden, the commander of the Allied left and the man responsible for leading the attack, was completely drunk and fled as well.
Kienmayer covered his withdrawal with the O'Reilly light cavalry, who gallantly managed to defeat five of six French cavalry regiments before they too had to retreat.
General panic now seized the Allied army and it abandoned the field in all possible directions.
A famous episode occurred during this retreat: Russian forces that had been defeated by the French right withdrew south towards Vienna via the Satschan frozen ponds.
French artillery pounded towards the men, and the ice was broken due to the bombardment.
The men drowned in the cold ponds, dozens of Russian artillery pieces going down with them.
Estimates of how many guns were captured differ: there may have been as few as 38 or more than 100.
Sources also differ about casualties, with figures ranging between 200 and 2,000 dead.
Many drowning Russians were saved by their victorious foes.
However, local evidence, only later made public, suggests that Napoleon's account of the catastrophe may have been totally invented; on the emperor's instructions the lakes were drained a few days after the battle and the corpses of only two or three men, with some 150 horses, were found.
Meanwhile, the northernmost part of the battlefield was also witnessing heavy fighting.
Prince Liechtenstein's heavy cavalry began to assault Kellerman's lighter cavalry forces after finally arriving at the correct position in the field.
The fighting originally went well for the French, but Kellerman's forces took cover behind General Caffarelli's infantry division once it became clear Russian numbers were too great.
Caffarelli's men halted the Russian assaults and permitted Murat to send two cuirassier divisions into the fray to finish off the Russian cavalry for good.
The ensuing melee was bitter and long, but the French ultimately prevailed.
Lannes then led his V Corps against Bagration's men and after hard fighting managed to drive the skilled Russian commander off the field.
He wanted to pursue, but Murat, who was in control of this sector in the battlefield, was against the idea.
Napoleon's focus now shifted towards the southern end of the battlefield where the French and the Allies were still fighting over Sokolnitz and Telnitz.
In an effective double-pronged assault, St. Hilaire's division and part of Davout's III Corps smashed through the enemy at Sokolnitz and persuaded the commanders of the first two columns, generals Kienmayer and Langeron, to flee as fast as they could.
Buxhowden, the commander of the Allied left and the man responsible for leading the attack, was completely drunk and fled as well.
Kienmayer covered his withdrawal with the O'Reilly light cavalry, who gallantly managed to defeat five of six French cavalry regiments before they too had to retreat.
General panic now seized the Allied army and it abandoned the field in any and all possible directions.
A famous yet frightful episode transpired during this retreat: Russian forces that had been defeated by the French right withdrew south towards Vienna via the Satschan frozen ponds.
French artillery pounded towards the men, but Napoleon redirected his gunners to fire at the ice.
The men drowned in the viciously cold ponds, dozens of artillery pieces going down along with them.
Estimates on how many guns were captured differ; there may have been as low as 38 and as high as over 100.
Sources also differ on casualties, with figures ranging from as low as 200 to as high as 2,000 dead.
Because Napoleon exaggerated this incident in his report of the battle, the low numbers may be more accurate, although doubt remains as to whether they are fully correct.
Many regard this incident as one of Napoleon's cruelest acts in war. 
Early on, in the morning of 25 July, General Nansouty set two of his divisions in motion, from the village of Boudilova and towards Ostrovno, in accordance with the orders he had received from the Emperor.
Meanwhile, Joachim Murat, commanding the French forces in this sector, departed from the village of Bechenkowitschy with two battalions of the 8th Light infantry regiment, and headed towards Nansouty's position.
Following Murat was the entire IV Army Corps of Viceroy Eugène, spearheaded by the division of General Delzons, which was followed at some distance by that of General Broussier.
With Murat not yet on the field of battle, Nansouty's men encountered the vanguard of the Russian IV Corps, namely the 11th division under General Choglokov, the 23rd division of General Bakhmetiev, some cavalry and an artillery support of 66 pieces.
Nansouty had under his command the light cavalry division of Bruyères (brigades Jacquinot, Piré and Nienwiewski) and the heavy cavalry division of Saint-Germain.
In a bid to pin down the enemy and despite the disproportion in forces, Nansouty sent forward Piré's brigade (16th "Chasseurs à cheval" and 9th "Chevau-légers lanciers") in a successful charge that dislodged the Russian vanguard and took 150 prisoners of war and 8 artillery pieces.
Murat then arrived on the battlefield with reinforcements, deploying his two battalions of light infantry, and assuming personal command of Saint-Germain's cuirassier division.
With the cuirassiers successfully countercharging and repulsing a Russian Dragoon regiment that had come up to attack the right wing of the French forces, Murat realised that he was in a dangerous position and sent word to General Delzons to hasten his march towards the field of battle.
Several attacks ensued, with the French committing Jacquinot's cavalry brigade and the infantry, but with the Russians holding ground.
Realising his numeric superiority, the Russian commander, General Ostermann-Tolstoy, launched an attack against both French wings, in an attempt to catch them in double envelopment.
However, with the arrival of a fresh French division, Delzon's 13th division, the Russian commander decided to call off his attack and pull back.
Murat opted against a pursuit, given his inferior forces and knowing that Broussier's division was too far off behind Delzons to be counted on. 
At its beginning, Napoleon's Grande Armée comprised seven army corps, the Imperial Guard, the artillery reserve, and the Cavalry Reserve.
The latter consisted of two cuirassier, one light cavalry, and five dragoon divisions, including one dismounted.
The mass of 22,000 cavalrymen was supported by 24 pieces of artillery.
The remainder of the army's cavalry was distributed among the army corps in brigades or divisions.
Napoleon appointed Marshal Joachim Murat to command the Reserve Cavalry.
Generals of Division Étienne Marie Antoine Champion de Nansouty and Jean-Joseph Ange d'Hautpoul led the cuirassier divisions while Generals of Division Louis Klein, Frédéric Henri Walther, Marc Antoine de Beaumont, and François Antoine Louis Bourcier headed the dragoon divisions, and General of Division Louis Baraguey d'Hilliers commanded the dismounted unit.
On 8 October 1805 at the Battle of Wertingen, Murat and Marshal Jean Lannes attacked an isolated Austrian division under Feldmarschall-Leutnant Franz Xaver von Auffenberg.
Murat's horsemen included Klein's 3,000-strong dragoon division, Beaumont's 2,400-man dragoon division, and some light cavalry under Generals of Brigade Antoine Charles Louis de Lasalle and Anne-François-Charles Trelliard.
With the support of some V Corps infantry, Murat's horsemen rode down the hapless Austrians, inflicting losses of 400 killed and wounded, 2,900 prisoners, six guns, and six flags.
The French admitted 174 casualties.
The cavalry saw much service during the rest of the Ulm Campaign.
At the Battle of Haslach-Jungingen on 11 October 1805, the 15th and 17th Dragoon Regiments lost their eagles.
However, the action was a French victory over a greatly superior force.
Murat led his horsemen in a series of actions between 16 and 18 October before securing the surrender of Feldmarschall-Leutnant Franz von Werneck's Austrian corps.
In these clashes Klein's 1st, 2nd, 4th, 14th, 20th, and 26th Dragoon Regiments, the 1st Cuirassier Regiment, and other units were involved.
In the Battle of Schöngrabern on 16 November, Klein's troopers were engaged as were the 11th, 13th, and 22nd Dragoons from Walther's division.
At the Battle of Austerlitz on 2 December, Murat led approximately 7,400 cavalrymen including Nansouty's 1st Heavy Cavalry Division, Hautpoul's 2nd Heavy Cavalry Division, Walther's 2nd Dragoon Division, General of Division François Étienne de Kellermann's light cavalry division, and General of Brigade Édouard Jean Baptiste Milhaud's light cavalry brigade.
Beaumont's 3rd Dragoon Division was attached to the IV Corps while Bourcier's 4th Dragoon Division with 2,500 men and three guns were attached to the III Corps. 
Thus began one of the greatest cavalry charges in history.
Somewhat obscured by the weather, Murat's squadrons charged through the Russian infantry around Eylau and then divided into two groups.
The group on the right, Grouchy's dragoons, charged into the flank of the Russian cavalry attacking St Hilaire's division and scattered them completely.
Now led by Murat himself the dragoons wheeled left against the Russian cavalry in the centre and, joined by d'Hautpoult's cuirassier division drove the Russian cavalry back on their infantry.
Fresh Russian cavalry forced Murat and the dragoons to retire, but d'Hautpoult's cuirassiers broke through everything and the broken Russian were cut to pieces by fresh regiments of cuirassiers.
D'Hautpoult then rode through the Russian guns chasing off or sabering the gunners and burst through the first line of Russian infantry trampling a battalion of infantry that attempted to stand.
The cuirassiers forced their way through the second line of Russians and only after 2,500 yards did the charge finally expend its force in front of the Russian reserves.
A second wave of cavalry consisting of the Guards and Grouchy's dragoons now charged the Russians as they attempted to reform and also rode through both lines of infantry.
Another group charged into the Russian infantry in the area where Augereau's corps had made its stand.
Not content with these heavy blows, the cavalry reformed, wheeled, and charged back again, finally retiring under the protection of the Guard cavalry.
Murat had lost 1,000 to 1,500 well-trained troopers, but relieved the pressure on Augereau, Saint-Hilaire, and Soult paralyzing the Russians long enough to allow Davout to deploy in strength.
Rarely had French cavalry played such a pivotal part in a battle.
In part this was because, for the first time, Murat's men were now mounted on the best cavalry horses in Europe, freshly requisitioned in the aftermath of the conquest of Prussia.
Davout's corps, about 15,000 strong, was now in position and began to drive in the Russian left.
Despite the disarray of the Russian centre, Napoléon declined to follow up Murat's charge by advancing with the Guard.
Such a move may have decisively won the battle, but Napoléon, well aware that 9,000 Prussians under L'Estocq and his chief of staff Gerhard von Scharnhorst were still unaccounted for, judged it wise to retain the Guard in reserve.
Through the afternoon, Soult, Augereau, and Murat managed to hold their ground while Davout, assisted by Saint-Hilaire, gradually bent the Russian left back further and further pushing it back to a right angle with the Russian centre.
By 15:30 it seemed that the Russian cohesion would soon break as their left was in full retreat.
For several crucial hours Bennigsen could not be found, he having personally ridden to L'Estocq to urge that general to hasten the march of his Prussian corps to the battlefield.
Bennigsen's mission was crowned with success.
L'Estocq's 9,000 man Prussian force, having lost a third of its strength to Ney's pursuit, approached the battlefield via the Russian right and passed completely behind the Russian position to its left wing, gathering strength in doing so by collecting Russian stragglers and adding them to the 6,000 Prussian troops.
At 16:00 L'Estocq counterattacked by falling on Davout's exposed right flank, and the heartened Russians soon launched a fresh attack against Davout.
Over the next three hours Davout was halted and forced back to a line running from the village of Kutschitten to near the village of Anklappen towards Saint Hillaire's right by Eylau.
Davout alert to the danger, formed a battery of his guns on the heights of Klein Sausgarten and personally rallied his troops while his guns drove the Prussians back into the woods.
With nightfall, exhaustion set in and fighting on the Russian left petered out.
By then the roar of cannons on the Russian right announced Ney's arrival.
Napoleon had not recalled Ney until 08:00 on the morning of the 8th when he realized that the Russians intended to fight.
Although within marching distance of the battle, the heavy snow had muffled the sound of cannon fire and Ney was completely unaware of events until a messenger reached him around 10:30.
Somewhat delayed by L'Estocq's rearguard, the leading division of Ney's corps did not reach the battlefield until around 19:00 and immediately swept forward into the Russian right and rear.
Bennigsen counterattacked.
Bitter fighting continued until 22:00, at which point both sides drew off a little.
After a contentious council of war with several of his generals forcefully arguing for continuing the fight for a third day, at 23:00 Bennigsen decided to withdraw and, covered by the Cossacks, the Russians silently began to leave.
The exhausted French did not even notice until 03:00 and were in no condition to pursue.