Sentence:  But then I had the flintlock by me for protection. ¶ There were giants in the days when that gun was made; for surely no modern mortal could have held that mass of metal steady to his <WSD>shoulder</WSD>. The linen-press and a chest on the top of it formed, however, a very good gun-carriage; and, thus mounted, aim could be taken out of the windownb.... 
Meaning of the word marked with <WSD> tags:  The part of the human torso forming a relatively horizontal surface running away from the neck.