The lay of the land about Boston was also different from anything in the general’s military experience. In the simplest terms, as he drew in his own rough map, the setting was one of three irregular peninsulas at the head of Boston Harbor, with the peninsula of Boston in the middle, that of Charlestown (and Bunker Hill) just to the north, and Dorchester close by to the south. But as Boston was connected to the mainland only by a narrow, half-mile causeway, or neck, it was more like an island than a peninsula. And thus, by barricading the Neck, it had been relatively simple to keep the British
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