Perhaps the aliens are fleeing some unknown calamity which rendered their homeworld uninhabitable and the shipload or three in the fleet is all that's left of the entire race? Perhaps they invade simply out of desperation for a habitable planet and their resources are almost expended?
This could explain why they're not busily mining asteroids and conquering other planets - they are travelling in little more than high tech lifeboats to the nearest/only planetary body in range. Could also explain why they make stupid tactical and strategic mistakes - they're predominately civilians and armed with little more than what passes for shotguns and hunting rifles.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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