There are several good stories about the map. Start with this one from the Library of Congress, who keep the map. And a more local perspective from the NPS Minuteman Park, and Baahston Marathon Day,
Leaving Boston in a hurry on Evacuation Day in 1776, Ensign De Berniere left several papers that were then publsihed as General Gage's Instructions and a curious narrative. These are quoted here.
February 1775.
Su Mo Tu We Th Fr Sa
19 20 21 22 23 24 25
29 30 31 1 2 3 4
Captain Brown and Ensign D'Berniere left Charlestown on Thursday, 2/23, and slept at the Golden Ball in Weston. On Friday, 2/24, they walked to Framingham, almost certainly along Old Connecticut Path through Wayland, which was part of Sudbury at that time, see map below.
On Saturday, 2/25, they continued to Worcester;
Sunday, 2/26, to Worcester;
Monday, 2/27 back to Framingham.
On Tuesday, 2/28, they returned to the Golden Ball in Weston.
On Wednesday, March 1st, they marched though Sudbury to Marlborough, but they left abruptly 10:30PM to return back to Weston. Very early on
Thursday, they passed through Sudbury again, with a minor bit of harrasment, and arrived back in Weston at 2PM. Here are the passages through Sudbury. I am very confident they would have walked to what is now Wayland center, then followed Rte 27 accross the river, then River Rd to Old County Rd back to Rte 20. The Rte 20 causeway over the river was not built, yet.
Wednesday, March 1st, starting from the Golden Ball in Weston.
"- At two o'clock it ceased snowing a little, and we resolved to set off for Marlborough, which was about sixteen miles off; we found the roads very bad, every step up to our ankles ; we passed through Sudbury, a very large village, near a mile long, the causeway lies across a great swamp, or overflowing of the river Sudbury, and commanded by a high ground on the opposite side; nobody took the least notice of us until we arrived within three miles of Marlborough, (it was snowing hard all the while) when a horseman overtook us and asked us from whence we came, we said from Weston."
Thursday, March 2nd, having left Marlborough abruptly at 10:30PM after being warned of impending danger.
"we got without being perceived, as
far as the hills that command the causeway at Sudbury,
and went into a little wood where we eat a bit of bread
that we took from Mr. Barnes's, and eat a little snow to
wash it down. -- After that we proceeded about one hun-
dred yards, when a man came out of a house and said
those words to Capt. Brown, "What do you think will
become of you now," which startled us a good deal,
thinking we were betrayed. -- We resolved to push on at
all hazards, but expected to be attacked on the causeway ;
however we met no body there, so began to think it was
resolved to stop us in Sudbury, which town we entered
when we passed the causeway ; about a quarter of a mile
in the town we met three or four horsemen, from whom
we expected a few shot, when we came nigh they opened
to the right and left and quite crossed the road, howe-
ver they let us pass through them without taking any no-
tice, their opening being only chance ; but our appre-
hensions made us interpret every thing against us. -- At
last we arrived at our friend Jones's again, very much
fatigued, after walking thirty-two miles between two
o'clock and half-after ten at night, through a road that
every step we sunk up to the ankles, and it blowing and
drifting snow all the way."
The long causeway commanded by a high ground is now River Road and Rte 27.
J.L. Bell has a blog called Boston 1775 with stories about the spies stay at the Golden Ball, thoughts about map, Ensign Henry DeBerniere, and Capt. William Browne.
Brown & DeBerniere probably took Old Connecticut Path twixt Weston & Framingham on 2/24 and 2/28. That went thru Sudbury at the time, as the town did not split until 1780. More: 1776 assembled from Mathias Mossman's two maps and evolution of town bounds.
2024-08-14 <> jch.com/history/250/BrownDeBerniere.html<> jch