Pablo1869 wrote:
I think that is naturally that they used the same formation like small units.
The key word there seems to be "think" - and as it happens I myself think you are wrong!
Formations don't just scale up seamlessly. The whole purpose of a wedge formation is presumably that it is quite pointy. I personally wouldn't count 1000 soldiers in a in 5 ranks of 198,199,200,201,202 as a "wedge"
To keep it pointy as you add more soldiers to the formation means it is inevitably going to get deeper and deeper, and there is presumably some number of ranks past which adding more on the back is not as effective as taking those soldiers and deploying them in another small wedge alongside. Exactly what formation are you proposing that 1000 soldiers (which is about what a 4-base BG represents) should be in to both be a) effective as a fighting force on a typical ancient battlefield, and b) different enough in behaviour to justify special rules?