Protective horse in field?

Looking for advice as have recently bought a new horse and finally worked up the guts to put together with another horse and pony in a field. The two horses are get along very well but as soon as the pony is added into the mix he scares of the new horse. We have tried catching the pony and leading him in the field... show more Looking for advice as have recently bought a new horse and finally worked up the guts to put together with another horse and pony in a field. The two horses are get along very well but as soon as the pony is added into the mix he scares of the new horse. We have tried catching the pony and leading him in the field while the other two are roaming around and it went well but when the pony was released he immediately scared of the new one! Any advice on how to make them get along? They have all been hacked out together and are fine, we ideally don’t want to have them in separate fields but will do that if the problem isn’t solved. Any help is appreciated! Xx
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