The Xindi were also informed by the Guardians, at least as early as 2152, that they would be victims of a genocidal attack from humans in the 26th century. Following their guidance, the Xindi launched a pre-emptive test strike on Earth as a precursor to a devastating second attack. In ' timeline, Xindi crewmen serve in the Federation in the 26th century, in a battle with humans and Xindi against the Sphere Builders. With the help of Captain Archer's evidence of the future cooperation, the Xindi Council began to split over the issue of whether the Guardians were the real enemy or not. The split widened when Reptilian Council Member killed Primate Council Member .