They began working through the night to build structures suitable to defend against the British Army .
On the night of March 4 , 1776 , as 800 American soldiers stood guard along the river of Dorchester shores , 1,200 American soldiers occupied Dorchester Heights .
soldiers began working through the night to build structures suitable to defend against the British Army .
On the night of March 4 , 1776 , as 800 American soldiers stood guard along the river of Dorchester shores , 1,200 American soldiers occupied Dorchester Heights .