I also second the walking down method.
Go out into the field with the halter and lead rope, and just follow the horse. Don't make it run, don't yell or get angry, just keep following. I don't like to run a horse because, as I've found from my personal experiences, forcing them to run just teaches them to do exactly that every time they see you coming. Maybe I didn't do it right? Who knows. I just have not found much success with running them. Also, when you get them running, it seems to put them in a flighty, fearful state of mind and of course, a horse doesn't learn when it's scared.
Anyways! If it stops, push it on firmly but not meanly. Once the horse is willing to stop and face you and look at/pay attention to you, it can stop. The instant the horse stops, you stop your advance and take a step or two backwards. Then just stand there. If the horse looks like it wants to move off again or takes its attention off you, resume your advance and continue moving it on. As long as it stays still, you just stand still and keep watching.
Eventually, when it starts to relax (head down, licking and chewing, gives a sigh etc), then you walk up and stroke it. Between the eyes, then it's neck and so on.
As long as the horse is relaxed with you near it, it's a win for you. You don't even necessarily have to halter it to have "caught" it. I can't say for sure if this is true for every horse, but all the times I've done it, I know I've done it right because the horse will follow me when I walk away. Though I also do not claim to be a trainer or vastly experienced horse person-the worst catching problems I've had to deal with were walking stubbornly away from you-no gallop-the-other-ways or unhandled ones yet.
Treats can help just as an extra incentive, but I wouldn't bribe a horse with them. You don't want to be sneaky or grab the horse as soon as you get near it. Just like everything, be open and clear about what you want, and take it slow and steady.
I don't know how much I've left out...it's late, and I'm tired.
Last edited by pintophile; 09-07-2011 at 12:21 AM.