sentences:  During his tenure, he worked proactively to extend Virginia's western borders past the Appalachian Mountains, despite the British Royal Proclamation of 1763.He notably defeated the Shawnee nation in Dunmore's War, gaining land south of the Ohio River.As a widespread dislike for the British crown (as a result of the American Revolution) became apparent, however, Dunmore changed his attitude towards the colonists; he became frustrated with the lack of respect towards the British Crown.