Gelding attacking a new horse

[ahlam1399]

So as the title suggests my gelding is attacking 2 new horses at the yard, he has been in the herd for a year and a half and have had no issues what so ever, all get on great, eat out of the same hay bin, all respect each other at coming in time, there was 4 of them and 3 since October last year, recently 3 new geldings joined the herd, within 3-4 days all from separate yards , one of them he started chasing within a day and just kept chasing him away from the herd . I got told by another livery this said horse has also been bothering mine ? Anyway today I arrived and he was chasing another away from the herd and was biting him and did make quite a mess, but was grooming with said pony earlier in the day?? I feel awful for the other ponies , I also got told one of the other existing liveries horses had also double barreled the new oneI understand time is required and they need to sort it out but obviously the other owner isn't too happy about this, the 3rd horse has slipped into the herd with no issues!!

أكثر... (https://forums-secure.horseandhound.co.uk/showthread.php?760360-Gelding-attacking-a-new-horse&goto=newpost)