"Ships 15 Old Guard Grenadiers. Any remaining Middle Guard are upgraded to Old Guard."—In-game description
Garde Imperial 3 is a technology in Age of Empires III that is unique to the French and can be researched at the Church once the Industrial Age is reached, the Edict of Nantes Home City Card has been sent, and Garde Imperial 2 is researched. Once researched, 15 Royal Guard Grenadiers named Old Guard will appear in the Home City shipment point and the previous twelve Middle Guards (if they still remain) will be upgraded to Old Guards.
Garde Imperial 3, along with the previous Garde Imperial 1 and Garde Imperial 2, is the only way for the French to acquire Grenadiers.
- The French Expeditionary Company and French Expeditionary Force (if sent at the Industrial Age), available for the Chinese and the Indians in The Asian Dynasties through the Consulate by allying with the French, includes Old Guards. Unlike the French version however, the Consulate version is automatically upgraded in every Age.
|Unique Church/Mosque technologies in Age of Empires III|
|Age of Empires III|
|British||Thin Red Line · The Black Watch · Roger's Rangers|
|Dutch||Coffee Trade · Waardgelders · Stadhouders|
|French||Code Napoleon · Garde Imperial 1 · Garde Imperial 2 · Garde Imperial 3|
|Germans||Tilly's Discipline · Wallenstein's Contracts · Zweihander|
|John Black's Mercenaries||Indian Friendship · Customized Merc Weapons|
|Knights of St. John||Corselet · Tax Burden · High Crusade|
|Ottomans||Tufanci Corps · Topcu Corps|
|Portuguese||Encomienda Manor · Besteiros · Order of the Tower and the Sword|
|Russians||Westernization · Kalmucks · Petrine Reforms · Bashkir Ponies|
|Spanish||Corselet · Quatrefage · Wild Geese|
|United States||Grand Encampment · American Patriots|
|All of the listed technologies require the Royal Decree Home City Cards unique for each civilization|