First an apology for depending so much on wikipedia.
I assume you are building a force representing Napoleon being somewhere observing the Action? There are lots of elements of the Imperial Guard besides just the Old Guard.
If you choose to go this ultra elite force route you might consider "Middle Guard" and "Young Guard" forces depending on your time period. This gives you more choices and units but also gives you some more units that lack the aura of near-invincibility.
Some selected interesting bits:
The Consular Guard (Gardes des Consuls) consisted of 2 battalions of foot grenadiers and 1 company of light infantry. In the end of 1800 the company of light infantry increased to battalion of chasseurs. At the battle of Marengo the Consular Guard transitioned to a battle formation.
In 1804 after his crowning, Napoleon transformed the Consular Guard into the Imperial Guard (Garde Imperiale).
In 1809 the Guard participated in all great battles.
The increase of Guard came in 1810 from the incorporation of the Dutch Royal Guard.
In 1810 the Guard was officially divided into Old Guard, Middle Guard and Young Guard. Only the 1er Grenadiers and 1er Chasseurs carried Eagle.
In 1812 the structure of the Imperial Guard was as follow:
Old Guard:
. . . . 1er Grenadiers
. . . . 1er Chasseurs
. . . . Company of Veterans
. . . . Gendarmes
. . . . Officers and Sergeants of Middle Guard
. . . . Officers of Young Guard
Middle Guard:
. . . . 2e Grenadiers
. . . . 2e Chasseurs
. . . . Fusiliers-Grenadiers
. . . . Fusiliers-Chasseurs
. . . . Velites of Turin (Italians)
. . . . Velites of Florence (Italians)
. . . . NCOs of Young Guard
Young Guard:
. . . . 1er, 2e, 3e, 4e, 5e, 6e Tirailleurs
. . . . 1er, 2e, 3e, 4e, 5e, 6e Voltigeurs
The Splendid Guard Perished in Russia
The campaign in 1812 in Russia ruined the Guard. Approx. 50,000 foot and horse guardsmen had been reduced to 1,100.
1813-1814
The New and Larger Guard
The years of 1813-1814 saw the Young Guard fighting in every major battle. Even the Old Guard was used in combat (Leipzig, Hanau, Craonne etc.)
1815
Napoleon had to rebuilt the Guard again in 1815.
A a levy of selected 2 officers and 20 men from each line and light infantry regiment joined the new Guard. Only the 1er Grenadiers and 1er Chasseurs were filled with men with 12 years' service and with the men of Elba Battalion. They were the Old Guard, the sine pari (without equal). Almost 30 % of the I/1er Grenadiers were veterans of 20-25 campaigns, one third was awarded for bravery. They averaged 35-years of age.
The 2e Grenadiers and 2e Chasseurs accepted men with 8 years' service.
The 3e and 4e Grenadiers, and 3e and 4e Chasseurs were filled up with men with only 4 years' service.
The beaurocrats in Ministry of War named the 2e, 3e and 4e regiments Old Guard, but the army called them Middle Guard. The Young Guard consisted of volunteers, retired men, Corsicans, recruits and even deserters.
All the above from -
http://www.napolun.com/mirror/web2.airmail.net/napoleon/IMPERIAL_GUARD_infantry_1.htmLots of organizational details and battle history over time later in the article too!
The Imperial Guard (French: Garde Impériale) was originally a small group of elite soldiers of the French Army under the direct command of Napoleon I, but grew considerably over time. It acted as his bodyguard and tactical reserve, and he was careful of its use in battle. The Guard was divided into the staff, infantry, cavalry, and artillery regiments, as well as battalions of sappers and marines. Another division existed in distinguishing the experienced veterans from less experienced members: the Old Guard, Middle Guard and Young Guard. - http://en.wikipedia.org/wiki/Imperial_Guard_(Napoleon_I)
From VArious sources:
There were four regiments of Old Guard infantry: the 1st Grenadiers, 2nd Grenadiers, 1st Chasseurs, and 2nd Chasseurs. -
http://en.wikipedia.org/wiki/Old_GuardThere were four regiments of Old Guard cavalry: the Grenadiers à Cheval (mounted grenadiers), Chasseurs à Cheval (mounted chasseurs), Dragons de l'Impératrice (the Empress's Dragoons), and the 1st Polish Lancers.[citation needed]
The Mamelukes squadron was also considered part of the Old Guard cavalry.
The Legion de Gendarmerie d'Elite (elite Gendarmes) was counted as Old Guard cavalry. It was deployed in detachments as escorts for Napoleon's headquarters and the General Staff of the Guard, and for Imperial Guard field camps.[citation needed] - again,
http://en.wikipedia.org/wiki/Old_Guard There is a section of what battles the OG cavalry fought in at
http://en.wikipedia.org/wiki/Grenadiers_à_Cheval_de_la_Garde_Impériale
And finally just to stir some thought: https://www.hexwar.com/secure/games/napoleons-last-battles/common/myths.html
Gracias,
Glenn