I'd suggest "UnitKilled" event handler instead. There you can check if everyone is dead as well doing something on individual unit death.

Samatra, there is already a killed EH.

This is about an event handler only firing when all units in a group are dead.. Needed for AI groups in Co-op missions for example.

Currently you have to constantly iterate over all units of a group to check if all units are down.

So virtually like the empty group EH which only fires when all units in a group are deleted.

In T170658#2413276, @Xeno wrote:

Samatra, there is already a killed EH.

This is about an event handler only firing when all units in a group are dead.. Needed for AI groups in Co-op missions for example.

Currently you have to constantly iterate over all units of a group to check if all units are down.

So virtually like the empty group EH which only fires when all units in a group are deleted.

I meant group's "Killed" event handler, which is added to the group and fires each time group unit dies. Unless you mean there is already one in https://community.bistudio.com/wiki/Arma_3:_Event_Handlers#Group_Event_Handlers

Example:

_group addEventHandler ["UnitKilled", {
	params ["_group", "_unit"];
	if(units _group findIf {alive _x} < 0) then {
		// Everyone is dead
	};
}];