A new truck arrives in the South Sudanese town of Renk, packed with dozens of elderly men, women and children, their exhausted faces betraying the strain of their traumatic journey out of war-ravaged Sudan. They are among more than half a million people who have crossed the border into South Sudan, which is struggling to accommodate the new arrivals. “The bullets were entering our house. We were trapped between crossfire in our own street. So we understood that we needed to leave for the good of our kids” Renk is just 10 kilometres (six miles) from Sudan, where fighting broke out in April last…