They spent the harsh winter in Valley Forge.
Old Valley
Valley Forge
Valley Forge, PA
Canada or in one of Washingtons big malls.
they spent the winter at the mountains.
Some changes are that they have behavioral changes and adaptions that keep them fed and warm through the harsh climates.
That varied depending on the contingencies of war. Most often they made winter quarters in Moristown, New Jersey. Most famously, in the winter fo 1777-1778 they camped in Valley forge Pannsylvania.
like normall
sleep
in its shell
To spend the northern winter in a nice warm place.