OK, here is what 1E has to say on the matter (hmmm...this really should be its own thread)
Fighters gain
"a body of men-at-arms". No details given that I've found as yet. It appears that "men-at-arms" in 1E is the equivalent of "followers" in 2E, based on the description of both fighters and paladins.
Rangers gain followers at 10th level. The ranger gets 2d12 followers in 1E as opposed to 2d6 in 2E. I noticed that they are called both followers and henchmen, interchangeably:
"...each ranger attracts a body of 2-24 followers. Note that these henchmen, once lost, can never be replaced...".
Paladins don't attract followers at all, as in 2E. His henchmen can only be LG alignment.
Wizards and
illusionists apparently do not attract followers. The 1E PHB is as silent on the matter as the 2E PHB.
Clerics gain tons of followers as they do in 2E. At 8th level, they gain 20-200 followers, but with no mention of level. Unlike 2E, the 1E PHB mentions that:
"in addition [to the 20-200 followers] there will be followers who are men-at-arms (q.v.) and your referee will relay the types and numbers at the appropriate time." I cannot find any reference to "men-at-arms", nor any other 1E source showing what these may be. Of course, given the beloved mess of 1E, it may just have escaped my notice at the moment.
Druids gain 3 followers (druids only) at 12th level, and more as they reach higher levels. Same as 2E except the Grand Druid did not exist at the time.
Thieves attract 4d6 followers - all thieves, though nothing is written pertaining to levels.
Assassins do not gain followers until they hit 14th level. As Guildmaster, they attain 7d4 (7-28) 1st level assassins.
Monks are treated strangely. At 6th level they attain 2 "henchmen". These can be fighters (but not rangers or paladins), thieves, or assassins. I suspect Gygax had one of his infamous bouts with insanity while writing this up (the other major one being demihuman level limits

), because it makes no sense. Why not monk followers? I can even see fighters, but thieves and assassins? Hardly lawful types. Monks gain an additional henchman each level above 6th, up to the limit defined by their Charisma scores. Now here is where it gets crazy...with monks, henchmen and followers are apparently different types of NPCs (as opposed to being the same as noted in the ranger entry. With monks, they gain (at 8th level) 2-5 1st-level monks (as long as they have a monastery). The monk gains an additional 1-2 monks each time he gains a level. However, follower monks leave their monk master when the followers attain 7th level.
Bards are allowed only druids, fighters or thieves who are human, elven, or half-elven only. Bards have a total of 1 follower at 5th level, 2 at 8th level, 3 at 11th, 4 at 14th, 5 at 17th, 6 at 20th, and "any number" at 23rd level, subject to his Charisma limit.
I'm gonna start a new thread for this because it's really a bit off the original topic. Afterwards, Cole, Stik...if you like, just delete these two posts from this thread.