Another division was deeply entrenched on Roxbury neck.

The light horse, and an inconsiderable body of infantry, were stationed in Boston.
The American army lay on both sides of Charles river.

The right occupied the high grounds about Roxbury; whence it extended towards Dorchester; and the left was covered by Mystic or Medford river, a space of at least twelve miles.

These extensive lines could not be contracted without opening to the British general a communication with the country.
For the purpose of a more distinct arrangement, the army was thrown into three grand divisions.

That part of it which lay about Roxbury constituted the right wing, and was commanded by Major General Ward; the troops near Mystic or Medford river formed the left, which was placed under Major General Lee.