Warhammer 40k and Hinowa ga crush

An imperial airship was on a recon mission but something got shot down by a rocket within a long distance and crush on an island the pilot and the passenger was all right but some are wounded and begin to build a camp around the damaged ship while the other search for supplies around the woods and which they found a village they look like peaceful people until they didn't know about their languages and they speak like native but the Elder of this village begin to speak their languages
He told them that they were on the island of Wakoku but it is under siege of a civil war they must help the people of this island and survive.