_arty = _this select 0;
_target = _this select 1;


while {alive _arty} do {
effectiveCommander _arty commandArtilleryFire [getMarkerpos _target, currentMagazine _arty, 1];
_arty setVehicleAmmo 1;
sleep 5;
};

EXEC WITH THIS

nul = [arty1,"Marker1"] execVM "arty.sqf";