Hi, I was in a similar situation a year or two ago! Returning to wargaming after many years, my original experience being in Warhammer.
You'll find all sorts of methods of basing for historical wargaming. Generally it doesn't matter which approach you choose, and if you're used to the rigid GW systems you should find this relaxed approach refreshing!
It's worth considering what sort of game you want to play - not the specific rules so much, but the scale. Skirmish or massed battle? Or something in between?
For massed battle games, people usually prefer to have several figures per base. Either an entire unit on one large base, or three or four figures per base (so each unit will consist of say, 6 bases of figures). Though of course there is nothing wrong with individual square bases, warhammer style - as long as you have an appropriate selection of movement trays! Companies like
Warbases will be your friend here.
For smaller skirmish gaming, individual bases are usually preferred - square or round (the latter seeming to be more popular). Though multi-basing can work fine too. The most popular medieval 'large skirmish' game is Lion Rampant - though individual bases are the norm here, the rules mean multi-basing works just as well.
Then there is the sabot base approach which has just been posted above me.
If you're defintiely going for mass battle and won't want your models to be used individually, multi-basing is generally the most appropriate and certainly has the potential to look the best. The actual layout of models on the bases doesn't matter, meaning you can get some really realistic looking units where the model's aren't organised in too-perfect ranks and files.
Many mass battle rulesets (the most popular for medievals including Hail Caesar, Sword & Spear and many others) require certain size unit bases, though they are generally relaxed about it. Do you have a regular opponent lined up, or someone who is starting this historical project with you? If so, seeing what size unit bases they are using might help you decide.
Having models 3 or 4 to a base on say, 40x40mm bases, is a good flexible approach in that it you can make units of various widths - 80mm wide, 120mm wide, 160mm wide, etc, to suit the rules you are using.
Some rulesets (I'm thinking of Hail Caesar) don't specify unit base sizes, just that they match up with your opponents.
However if you want to do both mass battles and skirmish, or aren't sure which you want yet, individual basing with sabots or movement trays might be the best solution.
The latter is what I do - in fact I do it warhammer style, on 20mm squares. This has the following advantages for me...
- I can play both large and small games (actually something in between the two is what I do).
- The models can be re-arranged for different sized units, which I am always doing.
- If I want to go back and repaint parts on certain models it is easy, as they aren't all attached to one base.
A disadvantage of this approach is that my models have to rank up neatly. If I'd gone for multi-basing, there would be much less headaches getting them to all rank up neatly.
It also could be argued that multi-basing looks better. However I think my approach looks just fine


Those are all on 20mm square plastic based from Renedra (2mm thick), on MDF movement trays from Warbases.
This approach makes my units quite compact, with the models close together. I really like this look personally, as I get lots of models into a small surface area. They look like nice dense formations, and it also has the bonus that I get as many models as possible onto a gaming table of limited size. Though as I said, it does mean I need to put a bit of thought into how they all rank up!
Often multi-based units have the models more spread out. Consider a unit of 30 men based my way. A unit using the multi-basing approach will often have either less men on the same surface area, or the same number of men on a larger surface area (and thus will take up more gaming space). As for me it's all about the aesthetic appeal of large formations of lots of men, my approach works well in this regard.