1809: Turn 20: 20 April 1809 The Battle of Regensberg
The leading elements of Davouts III Corps found the road from Eckmuhl to Regensberg blocked by the Austria IV Corps commanded by Rosenberg. Rosenberg having chosen to defend in depth deployed the 25,000 Infantry of Dedovich, Bartenstien and Somariva's Divisions supported by 2,000 light cavalry and 7 batteries of guns amongst rough terrain blocking the French advance. He was promised support from Hillers Corps to his rear.
Napoleon only had part of Davout's III Corps on hand as Morand, Friant and Demont had yet to arrive. Nevertheless Massena had promised that Molitors Division would be available by Mid-day and Saint-Cyr and his artillery by mid-afternoon.
French OOB
Gudin's Div. 11,000 infantry
Hiliare's Div. 11,000 infantry
St. Sulpice Div. 3,000 Hvy Cavalry
III Corps Art. 5 Batteries
Marulaz Div. 3,000 Lgt Cavalry
By Mid-day
Molitors Div. 7,000 Infantry
By Mid-Afternoon
Saint-Cyr's Div. 11,000 infantry
IV Corps Art: 5 batteries
Austrian OOB
IV Corps Rosenberg
Inf Div Dedovich: 12,000
Inf Div Bartenstein: 9,000
Inf Div Somariva: 4,000
Cav Div Somariva: 2,000
IV Corps Art: 7 Batteries
The French have cavalry superiority but the rough terrain will reduce the value of their superiority in artillery.
Having studied the situation and weighted the odds Napoleon decided to rely of his superiority in cavalry and the quality of his troops and launch a full scale frontal assault on the enemy position, throwing in Massena's reinforcements as and when they arrived. His hope being that the shear shock of his cavalry and infantry would overwhelm the enemy.
The Battle Unfolds
France (Frontal Assault) Napoleon v Austria (Defend in Depth) Rosenberg
Command Modifiers
Massena, outstanding execution (+24%)
Rosenberg fails to execute plan (-24%)
Hiller total command breakdown (-30%)
From the outset the speed of the French attack confounded the Austrian general staff. Rosenberg failed to deploy his reserves fast enough and Hiller's command of the reserves completely collapsed as he tried to make sense of the frantic reports received from his colleague.
Massena responded brilliantly to the situation feeding his reinforcements rapidly and decisively to expliot the weaknesses in the enemy defence and overwhelm their battle line.
The attack opened with Hilaires Division supported by St-Sulpice smashing into the partly deployed Austrian centre inflicting over 3,500 casualties.
At mid-day Gudin's Division added its weight to the attack and together with Hiliare and St.Sulpice a further 6,500 casualties were inflicted of the wavering Austrian troops.
Finally, in the closing stages of the battle Massena's freshly arrived Divisions or St.Cyr and Molitor were committed and the Austrian defence was overrun their infantry forced into squares could not retreat and Rosenberg asked for a parley to negotiate the surrender of his Corps.
In all the Austrians sufferred 28,500 casualties, the French 5,500.
But more importantly Inf Div. Bartenstein, Inf Div. Somariva, Cav Div. Somariva and the IV Artillery all laid down their arms and surrendered to the French. Soon after which Inf Div. Vincent belatedly sent by Hiller to reinforce Rosenberg arrived just in time to run into the victorious French advance and did likewise.
Of the forces engaged only Inf Div. Dedovich was able to escape.
Davout marched truimphant into Regensberg just before dusk.
Orders for 21 April 1809
Despite the unexpectedly decisive victory over Rosenberg's Corps at Regensberg today I am still faced with a problem. On the one hand I am keen to expliot the success at Regensberg by pursuing what I assume to be Hillers Corps and prevent its escape over the Danube at Straubing. But at the same time I am painfully aware that Lefebvre's Bavarians are likely to be roughly handled by the Austrian Corps debouching from Landshut unless I do something to prevent it.
I can see no option at this point but to split my forces. Lefebvre's VII Corps must be given support particularly as it is so deficient in cavalry, whilst the Austrian Corps confronting it is cavalry heavy with at least 2 Heavy and 1 Light Cavalry Divisions on its strength. To this end Massena's IV Corps and the Guard are ordered to march immediately to assist. Massena will move to seize Landshut and the bridge over the Isar whilst the Guard move to reinforce Lefebvre. Hopefully, the Guard Cavalry will arrive in time to avoid any major disaster. Napoleon will move immediately to join Lefebvre in order to stiffen the Bavarian's resolve.
Meanwhile Davouts III Corps supported by Lannes II Corps will march on Straubing. Hopefully, Hiller and his troops are still in shock following todays battle and the 80,000 or so troops descending on their line of retreat should be enough to secure a further victory, or at least hasten their withdrawal.
Battle Deployment
II Corps (Lannes) 23,000: To Straubing, Attack any enemy encountered en-route. March to the guns.
III Corps (Davout) 57,000: To Straubing, Attack any enemy encountered en-route seize the bridge over the Danube and deny it to the enemy. March to the guns.
IV Corps (Massena) 38,000: To Landshut, Attack any enemy encountered en-route. Seize the bridge of the Isar and deny it to the enemy. March to the guns.
VII Corps (Lefebvre) 32,000: To 22:14, Hold, Delay the enemy as long as possible and pin them in position until the IV arrives behind their right flank and the Guard arrives to reinforce you.
Guard (Mouton) 16,000: To 22:14, Move to support the VII Corps, attack any enemy encountered en-route. March to the guns.
Logistic's
300 supplies ordered from Donauworth to Ingolstadt to reinforce the main depot.
100 supplies sent to Regensberg.
Gency ordered to leave Donauworth and march to Ingolstadt.
Engineers ordered to leave Ulm and march to Ingolstadt.
Napoleon leaves Eckmuhl to jion Lefebvres VII corps at 22:14.