I'm making a minigame on a server, I have command blocks to summon a lot of zombies. All the zombies who are summoned are given the custom name of 'Infected'.
I need a way so when the game is done all the remaining Infected get killed by command blocks. I have tried setting it up so when the minigame is done a command block changes it to peaceful and then to normal again but on servers changing difficulty never really works. The server i'm working on is at 1.7.10. is this even possible in 1.7.10? I know you don't have the @e command.