Date of Battle of bunker hill?

The American colonists get some information regarding the British strategy of establishing their control over Boston's hills. As a result, the American colonists made a new strategy of moving their troops secretly onto the Bunker and the Breed's hill. Moreover, overnight they fortified the hills and prepared themselves for the battle. Therefore, when the British forces attacked the hills, the American troops fought back. They fought back the initial two charges but had to retreat during the third charge as they run out of resources.