The thing about mines is that people can run straight past em. You have to put one at the entrance to a building, then lay them in lines behind that door so that infantry will run along the line. Don't forget to keep some around the pedastal. Don't do what someone above said and just lay tons of mines around. They will all blow up whilst the infantry runs through em.I good way to combat mines is to get a few suicides in. As killing yourself with mines gives the opponents very few points, and this might lead to the destroying of a building, then you should run along a path to take out mines so that engineers can get through. The only trouble is that this will affect you score in laddered matches so people aren't very willing to do it in laddered.