In 1904, the Herero rebelled again. German General Lothar von Trotha implemented an extermination policy at the Battle of Waterberg, which drove the Herero west of the Kalahari Desert. At the end of 1905, only 16,000 Herero were alive, out of a previous population of 80,000. Nama resistance was crushed in 1907. All Nama and Herero cattle and land were confiscated from the very diminished population, with remaining Nama and Herero assuming a subordinate position. Labor had to be imported from among the Ovambo.