Gage was the new Governor of Boston Battle of Lexington and Concord on April 19, 1775 General Gage decided to seize the Charleston Peninsula, but on the night of June 16th 1775, 1,500 American troops occupied Breed's and Bunker Hill.
In London, the news of Bunker Hill convinced the king that the situation in the Colonies had escalated into an organized uprising and must be treated as a foreign war. Accordingly, he issued a Proclamation of Rebellion.
Battle of Bunker Hill - Wikipedia
The Battle of Bunker Hill was fought on June 17, 1775, only days after George Washington was elected Commander in Chief of the Continental Army. Despite the name, the battle was actually fought on Breed's Hill.