The best way I got mine to move over to the neighbor's yard was to go around daily for a while, sticking the hose down the holes and flooding their tunnels. They decided it was not a good place to make homes and have babies and moved all the way across the street (from what I could tell).
They usually come in the first place because you have a food source in your lawn. Grubs or other insects are what they eat (not the roots of the plants as some people think) so a treatment with a granular insecticide might be in order after you get them to move out. Right now if you have a big infestation, you need to flood the tunnels to drive them away. They are nesting and having babies down under there.
After this, when they start to come back again, just flood again for a few days and they'll go elsewhere. But keep a watchful eye and hit them as soon as you see new holes.
