In act 5, scene 6, all the soldiers are preparing to finally battle. I imagine that all soldiers at once begin to slowly draw their swords. However, this is only done after the general of the army yells “SOLDIERS AT YOUR READY!” The scraping of a thousand swords being drawn is a an obvious sign that there will be numerous deaths and these soldiers will do anything to bring down Macbeth.
Firmamente. “Sword Gif.” Tumblr. Web. 20 March 2016.