The milky spore probably helped a lot. We have an old, very large, ‘country’ sort of yard & all we do is mow. We have moles, too - if you get rid of beetle grubs with milky spore, the moles supposedly move on to ground with a better food supply.
We battle with grubs and moles nearly constantly in our yard, and chipmunks, while cute, are so destructive to my plants. Sometimes I think I should get the pellet gun out.