Definitely not Sparta! French maids

This is definitely not Sparta! We just happen to have the Eastern Army coming the way to our country and we just happen to have a huge mountain range blocking their ways and we just happen to have a single pass, big enough to allow an army to transport heavy equipment and you just happen to have 300 defenders. But they are definitely not Spartans, they are French maids! Author's Note: Scenario set to NSFW for gore level, not nudity.