DC2 and 3 playing indoors after tea, slightly raucously but within reasonable bounds (bit loud, but all friendly), DC3 (age 3) throws a teddy (possibly accidentally lets go, possibly on purpose) and crawls under coffee table, behind sofa, to retrieve it, clanging the side cover off the radiator (which is off, and the cover does come off if loose, no actual damage done, but annoying loud noise, slight shock, need to reach awkwardly about behind heavy sofa to re-attach it). DH shouts at all the kids that it's enough, they are too wild "go to bed - go!"
I wouldn't have sent them to bed in this case, not really questioning his right to make the decision, though I think it was a bit harsh and more about his P&Q than the kids behaviour being unreasonable...
However AIBU to think that once he has made the unilateral decision and banished them to bed he should follow through and "do bedtime" immediately (tooth brushing, washing, PJs, story, make sure they are in bed, tucked in) not issue the order and remain sitting on the sofa pretending the kids are not upstairs, wide awake, not in bed, still dressed undoubtedly and continuing the same game... They are 8, 6 and 3 - they are not going to put themselves to bed... I would have done bedtime, but later, just sat down.