Attacking the wall tiles

Now it’s time to attack the wall tiles. These were put around the counter top and are the small grayish ones. This may have been neat in the 80’s but it is ugly now.
The problem is that you can’t remove them easily since they were glued to the wall. I tried hammering the front but it didn’t work. They just wouldn’t break. The only option was to use a screwdriver as a wedge and hammer them off that way. Of course each time a dent was left in the wall. Also, the neighbors must have enjoyed the hammering.