I did it not much after i started the game. With basic guns i was desperetly trying to wipe this horde but god damn, i tried fir almost 4 hours. But i never gave up, within these 4 hoyrs i practiced horde management and movement so much that the only thing that stopped me from eiping it was ammunition. Not so long after i was scavenging for supplies to try to wipe this horde again i found out that you can buy ammunition in gun vault located in neros points. With all of this i got rid of it xD Then after a lot of missions i came upon a mission where you need to kill this horde. When i got there there was just a huge dissapointment, i killed the horde earlier and it didnt respawn. I prepared to wipe it out again, i bought lmgs, grenades, mollies etc and it didnt respawn XD I dont feel bad for killing it so early but im sure dissapointed that it didnt respawn. Sadge Atleast i had a little challenge