It's a movie where the man, I think he time travelled or some sort on a medieval/barbaric land where there are monsters. He only got his gun ( a plasma type thing ). He helped the people there to fight of the monsters/beasts. There's a scene here where they used the wines/beer to make and setup a trap to kill the beasts. The ending was the main character I think used a sword of some sort to kill the last beast but one of his comrade died

Outlander (2008)

From Wikipedia: A spacecraft crashes in a lake in Vendel-era Scandinavia. The only surviving occupant – a human – retrieves a distress beacon and a computer which explains that he is on Earth, a "seed" colony that his people have abandoned. The computer downloads the local Norse language and culture directly into his brain. The spaceman soon finds a freshly destroyed village, where he is captured by Wulfric, a warrior from another village.
...
The village is attacked that night by an unseen creature, which kills several men. Kainan tells them it is a "Moorwen", a predatory creature which caused his (space)ship to crash and now will hunt men and animals alike. When Kainan is taken with a hunting party to find the Moorwen, he kills a gigantic bear that had killed some of the hunters. The warriors now treat Kainan as part of their tribe.


https://en.wikipedia.org/wiki/Outlander_(film)