Toddler bleg

Anyone have any practical tips for dealing with toddlers who fight tooth and nail, especially when mom is tied down nursing the baby? Noogs and Babs are big enough and active enough to leave scratches and bruises on each other -- they both look appalling. And of course neither of them take it very seriously when I'm sitting in the arm chair trying to get the baby to sleep and quietly bellowing, "Both of you stop it right now! I mean it! If I have to count to three and get up, you two are in Big Trouble!"