Are these sentences worded and structured properly?

FYI- Obould is the orc king. With all of Clan Karuck’s victories against both the elves and the dwarves, Grguch had made Obould’s armies restless and eager for war. In response, Obould sent his shaman Nukkels to parley with the dwarves and apologize for the attacks, and he also dispatched a messenger to Grguch. The riders sent to Mithral Hall were captured by treacherous orcs, and when Grguch learned of this peace mission, he killed the messenger sent to him by Obould and prepared his own forces for an assault on Obould’s encampment in order to overthrow the king and continue the war against the Silver Marches.