 And what happened? Well, what happened on one night, with massive use of manpower and oxen, nearly 1,000 oxen, they put those guns on top of Dorchester Heights. And the British woke up the next morning, March 5, looked up and saw what had happened, and realized they had to get out. They were right under those guns, well within range, as were their ships in the harbor, which was maybe even more important.