Are these sentences properly worded?

FYI- Bareris is the bard. Shortly thereafter, Bareris infiltrated Delhumide and reached the magical portal with the help of the group of gnolls, but he entered the gateway alone. Once he arrived at the undead manufactory, Bareris managed to find Tammith, but she was forced to attack him. Bareris was able to incapacitate Tammith, and as he then tried to escape from the stronghold, he was confronted by Xingax. Bareris was nearly subdued by Xingax, but the bard ultimately managed to wound the mighty undead entity and flee into the Sunrise Mountains.