It seems like you are asking for a word that could replace "largely" in the sentence:
"The village was largely [word] and from accounts had been surprised by approaching cavalry contingents."
Here are some options:
* Unprepared: This implies the village was not ready for the cavalry's arrival.
* Unaware: This implies the village was ignorant of the approaching threat.
* Unfortified: This implies the village lacked defenses.
* Unsuspecting: This implies the village was naive and not expecting trouble.
The best choice will depend on the specific tone and meaning you want to convey.