Yet another unbound value error

I started with an ocaml file Bataille.ml and finally decided to build a project with dune. The initial set up was as below :

Bataille
   |---> Bataille.ml

Then I added the dune project:

PS H:\Ocaml\Bataille> cd ..
PS H:\Ocaml> dune init proj Bataille

which ended up with the following setup (untouched folders not detailed):

Bataille
  |--_build
  |--bin
    |-->dune
    |-->main.ml
  |--lib
  |--test
  |-->Bataille.ml
  |-->Bataille.open
  |-->dune-project

I slightly modified the main.ml file so that it looks like that :

let monte_carlos () = 
  let n = 52 in
  let (jeu1,jeu2) = Bataille.init([],[],n) in
  List.iter jeu1 print_int;;

As highlighted by ocamllsp, when I run a dune build I get this error:

PS H:\OCaml\Bataille> dune build
File "bin/main.ml", line 4, characters 20-33:    
4 |   let (jeu1,jeu2) = Bataille.init([],[],n) in
                        ^^^^^^^^^^^^^
Error: Unbound value Bataille.init

Which, as a dune beginner (and ocaml beginner as well, I shall confess) am not able to deal with.
I fear an issue with capital letters here or there, but … this is a mystery for me. I have red somewhere I would not have to declare my modules with dune, it will cope with it … I must have missinterpreted something.

Help appreciated.

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