[Vierville]

Well done to you for rescuing them! Sadly dwarf hamsters do fight when put together but it is just instinct for them. It doesn't mean that they have a bad nature and they will more than likely be very nice with you.

1cm bar spacing should be absolutely fine. My cages have 0.8cm spacing and even though one of my dwarf hamsters is a tiny baby he is nowhere near small enough to get through the bars.

Yours should be perfectly safe with 1cm spacing.

As Ria P said, please separate them as soon as possible. Dwarf hamsters are capable of causing terrible injuries to each other or even killing each other.

They will also each need as a minimum a wheel ( with a solid running surface and NOT the type that is made of bars that they run on or metal mesh) and a small hide/house that they can feel secure in.

You have done a really kind thing taking them in and I wish you all the very best!