Hmm. Well you'd have to go for small wishes. IE - If you wish for a weapon they will get a better one. So wish for something small. Like a sandwich, change for a bus, a can of your favourite drink. THEN the enemy only gets a good sandwich, a little more moeny than change for a bus, and 2 cans of their favourite drink.
Then when the try to attack me, they are unarmed and I shall take them in single combat with anything I have to hand.
Then when the try to attack me, they are unarmed and I shall take them in single combat with anything I have to hand.