Minecraft wiki entry for Player_versus_Player, associated text: A suggested tactic for a mass-team retreat on servers running Java 1.9+ versions: if you happen to be attacking as a juggernaut, take precautions in case of a forced retreat from battle, by bringing 1 stack obsidian, an efficiency IV+ diamond pickaxe, and end crystals, at least a dozen or so (if you don't have resources for juggernauts, just bring iron armor, 2 end crystals, and 4 obsidian blocks for a suicide-bomb version). First, get everybody around to retreat, now get your juggernauts and yourself to slow down the retreat by placing obsidian around them, one block above their feet. This often fools enemies into thinking the person's trapped, for one, and if they get close, place down the end crystal on the elevated obsidian, and fire in the hole! The explosion would easily kill off the peons chasing your team in iron, and likely even enemy juggernauts in protection IV if the difficulty is set on hard.