The Controllers' surprise attack came so abruptly that it caught everyone off guard. Generally, the Star Alliance had vast strategic early-warning systems and defenses set up within the Danlu Interstellar Cloud and two Star Sectors. A typical enemy wishing to approach Earth would have to breach the Star Alliance defenses.
However, during the previous encounter, Teizene employed a clever tactic that exploited a timing discrepancy, along with anti-warp interference technology, to break through to Earth. This time, the Controllers went even further by using a cross-dimensional energy transmission, a method only they had access to, taking the Star Alliance completely by surprise.
Evacuation was a global effort; governments from all of Earth's administrative regions began organizing mass departures. But such a massive evacuation was not something that could be completed quickly, certainly not before the Controllers touched down.