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Tassadar's Expeditionary Force discovered a number of the probes floating near the border of protoss space. Tassadar determined that they were headed for the Koprulu Sector but was unable to determine their origin point.
When the zerg arrived in the Koprulu Sector these probes were also encountered by the Dark Templar. The Dark Templar tracked the zerg to Char and chose to test themselves against small groups of zerg.
- Underwood, Peter, Bill Roper, Chris Metzen and Jeffrey Vaughn. StarCraft (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.
- Chris Metzen, StarCraft Legacy staff. 2009-04-03. SC:L Metzen Interview - Lore Exclusive. StarCraft Legacy. Accessed 2009-05-18.