DS1, 7 years old, went missing for a short while on Friday evening while I was at work and DH was left minding both him and DS2.
DH realised DS1 was not playing out in the cul-de-sac and went looking for him, calling at his friend's house. His mum said they had been playing in the field behind her house but couldn't see them now. DH went home as he had left DS2 asleep on the sofa.
DS1 turned up an hour later with friend and friend's mum in tow. She told DH they got lost wandering in the fields and ended up on a busyish country road 0.5km away. They eventually found their way home. I got home an hour later.
DS thinks I'm being cruel and unusual for grounding him to the front and back garden for the week. He has also lost the Wii for the week. He won't stop moaning, resulting in me relenting slightly and allowing him to play on the street. But not with the friend and he is not allowed to go near his house.
DH didn't think there was anything wrong with not looking for DS1. 
If I had been home and realised DS1 had disappeared into the fields I would have woken DS2, left him with a neighbour and gone looking for DS1. There are usually cattle in the fields (sometimes bullocks, sometimes cows with calves). There is not access to these fields except by going through the neighbours' back garden.
DS1 has form for wandering off and was only grounded for going into the fields two weeks ago. He has been told repeatedly not to go into the fields and I explained why ( danger of cattle/trespassing/injuring himself and no-one knowing where he is).
I decided not to loose the bat with either of them and explained calmly and rationally my feelings. But both think I am being unreasonable.
I may also cave in with DS1 if he doesn't stop whinging.
Cheers if you read this far. 