Thought I might add a little interesting info found recently on Facebook.
…, please see the post concerning the walls and loopholes.
As you can read, Alasdair White mentioned that the Great Barn roof was probably loopholed.
This is important because up till now, the specialists have had no written proof that the western wall had been protected.
Seems totally illogical not to have it protected as it's the most potentially vulnerable wall on the farm. Being the reason why I’m researching it !
I had come to the conclusion that the smoke given off by all the muskets inside a building would have made it impossible to aim correctly through loopholes following about 10 minutes of firing. (no ventilation)
On the other hand, holing the tiled roof would have had plenty of ventilation. (see the 3 round ventilation holes in the image which would have created an excellent draft)
As such, independent of the ventilation holes upstairs above the western door, the roof would have been an excellent position to ‘stop’ any French moving north along the cornfield. (AND REDUCING THE POSSIBILITY THAT THE DEAD FRENCH by the north gate originated from the west)
Impossible of course to see the lane, (they’re too high) but my next visit will look for HD telltale signs of brick repairs halfway up the wall. (loop-holing the inside…, they would have been standing on bales of hay)
PS The following was added on the 17th of April 2017: I have since seen Hougoumont model makers with loopholes in the curtain wall between the western door and the gardener's house. That seems totally logical !
I've also seen a window in a sketch where the gardener's wall (loft) has one looking west. (but that could be 'fantasy')