As Jay says, a 'floppy' fence generally stops
chickens, and there's bonus hilarity watching them realise they can't see the top and it's really wobbly!
As long as you don't cut into the dark, live base of the flight feathers, it's possible to cut the feathers really short.
Robert Marr wrote:
Should I trim the other side? Some say yes, some say no.
I say no. As far as I know, the point of clipping one wing is to put the bird off balance when it flies, and if both are clipped it will make just make it a poor, yet straight flier.