"For several more years the Lanteans were able to hold off their attackers, relying on the city's shield and superior weaponry, including the weapons satellite system. No matter how many Wraith ships they destroyed, more kept coming. They could win almost every battle but they saw no way to win the war, so they submerged the city and left."
—John Sheppard.
So it did, many times, but more fleets kept showing up, one after the other. By this point they only had one planet left, the Wraith controlled the rest of the galaxy. Atlantis' power was utterly irrelevant. They used the city's entire drone supply to fight of wave after wave of ships, because they came faster than the Ancients could construct more drones using resources from just the one single planet they had left.
Navitas
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