lawrence river, too, to try to blockade quebec or intercept ships that were coming from halifax one toboston -- down to boston to resupply the british army. washington was also using a fleet of of whale boats, small craft that were plying the waters of boston harbor and setting them to burn the lighthouse at the entrance to the harbor, looking for ways to disrupt the british, stealing sheep, burning hay on the small islands in order to starve them. and then the shallow draft allowed them to get away from the deep-hulled british ships. so with map in hand we can see washington really creatively using the topography to his advantage. and, of course, ultimately, door chester heights would be the key to ending the siege placing the guns from tie cond rogue georgia here on this commanding spot that would render boston untenable for the british. and, again, this sense of washington spontaneously using maps, this is his own drawing of the boston area in case anyone would be confused, he writes water, water, water. [laughter] makes a grid to show us boston and a grid for cambridge. and this he