I assumed they had come from within. A works team essentially.
They may well have done as I can’t remember the exact details, great grandad had some shares* in Arsenal and was a ref in the southern premier league in the early 1900s, have tried to research into it but mostly lost to the mists of time apart from occasional old match reports that pop up on the net from time to time.
* we only found out about 50yrs after he died, some heir hunter guy came knocking at my parents door, my mum ended up with 1 whole share – worth about 10k when it got sold.