In the British army the most senior officers of any particular rank up to lieutenant-colonel (lieutenants, captains, major etc) served in the 1st battalion of an infantry regiment, while the junior officers served in the second battalion (where there were two battalions as was commonly the case). This meant that there was a good deal of movement of officers between battalions, which could cause problems when the first battalion was on a distant station.
In the French army infantry regiments had a greater number of battalions, but all except a weak depot battalion generally - but not always - served together.
Did French officers shift between these battalions as they gained seniority, or did they remain in the one battalion at least until they were promoted up a rank?
Also, what was the basis of promotion for regimental officers in the French army? Merit? Seniority? Did most officers spend their whole career in the one regiment?
Promotion in the French army was usually within the regiment in order to maintain unit cohesion. And it was also usually within the same arm of service. Very seldom would a cuirassier officer be promoted into a chasseur a cheval regiment.
There were established rules of both seniority and length of service, although there were extraordinary promotions for valor and certain emergencies, such as Carnot's promotion from chef de bataillon to general officer to meet the his new assignment in 1814.
There were also field promotions and deserving enlisted men were promoted to sous-lieutenant by election, although these required 'permission' of the Ministry of War. There was also promotion by acclamation, a practice Napoleon participated in.
From 1805 the standards were serving four years in grade before promotion for officers, and enlisted men six to eight years, four as an NCO, before promotion to sous-lieutenant.
Staff officers were required to serve two years in grade with troops before being promoted.
This information can be found on page 168 of John Elting's Swords Around a Throne. Supporting information can be found in Elzear Blaze's memoirs, Coignet's memoirs, Jean Morvan's Le Soldat Imperial, Noel's Souvenirs, and Lejeune's memoirs.
Regarding infantry regiments, the change in organization of the infantry battalion in 1808 led to larger infantry regiments, and the battalions of the same regiment might not always serve together. When that did happen, the detachment of battalions could confuse and disrupt the administration of the regiment, and Napoleon sometimes did this in order to form provisional regiments in other theaters.
The depot battalions of the new regimental organization consisted of four companies as they had no elite companies. The 1st and 3d companies of the depot battalions 'were de marche units' which 'ferried' recruits to the field battalions of the regiment. the 2d company was used for 'local guard and security missions' at the depot and the 4th company processed and trained recruits. See page 214 of John Elting's Swords.
Thanks Kevin - that's very helpful
Terry Crowdy's book "Napoleon's Infantry Handbook" has a chapter on Promotion (Chapter 15), though I don't think he answers all your questions.
I hope this helps as a case study. For my book Wellington at Bay, I did some work on Maucune's Division of the Army of Portugal at Villamuriel in October 1812. Looking at the regiment and battalion commanders of the 4 regiments you get a very mixed picture; several examples of promotion within the regiment but lots of movement between regiments;
15e Ligne
Major Jacques-Louis Dornier served in the 2e Grenadiers de la Garde Consulaire, 43e Ligne, 15e Légère, 69e Ligne and 15e Ligne before becoming colonel of the 26e Légère.
1er Batn: Capitaine Jean Lafitte, Sgt Major in the 15e Ligne promoted through ranks to capitaine in the regiment.
2e Batn: Chef de Bn Alexandre François Frémin, Soldat 28e Ligne, SgtMajor 11e Ligne & then 103e Ligne , sous Lt, Lt and Capitaine in 103e Ligne, promoted to Chef de Bataillon in 1809 and joined the 15e Ligne in 1810. In 1813 promoted to major en seconde in the 153e Ligne.
66e Ligne
Colonel Jean Pierre Béchaud, joined as private 1787, served as chef de bataillon 4e Cote d’Or, 159e & 10e Demi Brigades, and then the 86e and 66e Ligne, then promoted to major and colonel in 66e Ligne.
4e Batn Chef de Bn Michel Izambard, joined as private 1792, 3e Charante Inferieur, Joined 66e Ligne as Lieutenant, promoted to Capitaine and then Chef de Bataillon in 66e. In 1813 he was became major en seconde in the 21e Ligne.
6e Batn Captain Leopold Daniel Charlemont; apptd lieutenant 1792 in 2/53e Regiment, promoted to captain in 1794, joined the 66e Ligne in 1810.
82e Ligne
Colonel Joseph Jacob van Geen, volunteered into Chasseurs Belges in which he was promoted to sous lt. and lt., joined 7e Demibrigade as lieutenant before promotion to capitaine. Joined 2e Légère as capitaine and then Lt. Col. in Dutch Royal Guard in 1807. Colonel in the 8e Ligne in 1809 and then the 126e Ligne, joined the 82e Ligne in 1811.
4e Batn Chef de Bn Michel Lefizelier, joined as lieutenant 16e Vol. Nationaux, 1792, chef de bataillon in 1809, then in the 57e Ligne, later transferred to the 82e Ligne. In 1813 became Major in 122e Ligne.
5e Batn Chef de Bn Jean Baptiste Dupré, born 14/10/1767, cannonier 1er Artillerie à Pied 1783, Caporal 1793, Marechal des Logis, Artillerie à Cheval 1792, Lieutenant 1793, Capitaine 1794; Capitaine Paris Guard 1803, Chef de Bataillon 82e Ligne April 1812.
86th Line
Colonel Claude Joseph Pélecier, joined as soldat 11e Haute Savoie Vol. 1792, promoted serjent, serjent major and sous-lieutenant 1792, lieutenant and adjutant major capitaine 56e Ligne, Chef de Bataillon 3e Légère 1806, Major 113e Ligne 1808 and then 103e Ligne 1809, Colonel 86e Ligne 1811.
1er Batn Chef de Bn Jean Luzinier, joined as private 1792, lieutenant 89e Demibrigade 1796, Capitaine 1800, joined 86e Ligne 1805, chef de bataillon 1809.
2e Batn Chef de Bn François Adam Eys, joined as sous lieutenant 77e Régiment d’Infanterie 1788, lieutenant 1793, capitaine 1795, became 86e Demibrigade and then 86e Ligne, Chef de Bataillon 86e Ligne 1811.
That sums it up very nicely, nothing better than such a case study.
Also regimental officers could be assigned for a while on staff duty and then be back for a battalion or regiment, as for example can be read in the memoires of Girod de l'Ain, for Fezensac.
Really good stuff - thanks Gary