SET DOMAIN_NAME="yourdomain.net"
SET BASE_PORT=7777
SET QUERY_PORT=7780

for /f "skip=4 usebackq tokens=2" %%a in (`nslookup "-type=A" %DOMAIN_NAME%`) do set EXTERNAL_IP=%%a

Battalion\Binaries\Win64\BattalionServer.exe /Game/Maps/Final_Maps/Derailed?Game=/Script/ShooterGame.WartideGameMode?listen -broadcastip="%EXTERNAL_IP%" -PORT=%BASE_PORT% -QueryPort=%QUERY_PORT% -log -defgameini="..\..\..\DefaultGame.ini"