you mean like Rohan Bodyguards (Rider of The King's House) on Fourth Age, Total War....

Yes, They are real monsters, even with 13 men (12 + 1 officer) as starting numbers, they still grows into 48 men army as Faction Leader... but this was good enough to represent the General's own private army... give them upkeep instead, so they didn't end as wageless elite cavalrymen