Throughout most of the series, there's a sense of "when the Andalites arrive everything will be over" and "just gotta hold out until the Fleet gets here" - they flat-out say it a few times, and imply it a great many more
Their initial exposure to Elfangor, who is naturally disposed to humans (and we all know why everybody sob now), and then further knowing Ax convinced them that Andalites might be a touch arrogant at times but they were the Big Good of the universe. Certainly they're the species with the best chance of defeating the Yeerks
When did you all start to realize that the Andalite military wasn't all it was cracked up to be? Did that hit you hard, or did you just expect it by the time it was revealed/you figured it out?