Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
All Attack Position "Meklord Army" monsters you control cannot be destroyed by battle, also their effects are negated.
--鉄壁の機皇兵
--The Resolute Meklord Army
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--disable
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetRange(LOCATION_SZONE)
	e2:SetTargetRange(LOCATION_MZONE,0)
	e2:SetTarget(s.target)
	e2:SetCode(EFFECT_DISABLE)
	c:RegisterEffect(e2)
	--indes
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetRange(LOCATION_SZONE)
	e3:SetTargetRange(LOCATION_MZONE,0)
	e3:SetTarget(s.target)
	e3:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e3:SetValue(1)
	c:RegisterEffect(e3)
end
s.listed_series={SET_MEKLORD_ARMY}
function s.target(e,c)
	return c:IsPosition(POS_FACEUP_ATTACK) and c:IsSetCard(SET_MEKLORD_ARMY)
end