hi! not discouraging any of the Shakespeare experts from contributing on this, but you may be interested in this related post

• How much did Shakespeare know about the historical Macbeth?

another on a specific plot point: In Shakespeare's Macbeth, soldiers from an enemy army cut down the trees of Great Birnum Wood and used them as camouflage to get closer to Macbeth's castle at Dunsinane. Would this tactic ever have been used in a real 16th century siege, and if so, how effective would the move be?

and a mention Why is MacBeth considered a tragic play and Julius Caesar considered a historical play when Shakespeare took extensive dramatic liberties with both?