 "Isabelle" saw only light action until 30 March, when the Viet Minh succeeded in isolating it and beating back the attempt to send reinforcements north. Following a massive artillery barrage on 30 March, the Viet Minh began employing the same trench warfare tactics that they were using against the central camp. By the end of April, "Isabelle" had exhausted its water supply and was nearly out of ammunition.
