Unknowingly Glenning had found the vulnerable spot in the old fellow's armour.
"The Man from Jericho"
Edwin Carlile Litsey
His comrades were scattered about the grinding mass making ineffective efforts to heave a butt or top clear of the others with their handspikes, but there was clearly only one vulnerable point of attack, and that was the one Nasmyth and Gordon were hewing at.
"The Greater Power"
Harold Bindloss W. Herbert Dunton
Hitherto this vulnerable spot had been conceived to lie in Production, as in the last resort it certainly does; but short of that and actual industrial war, there was the equally effective and less perilous paralysis, the secret of which lay in Distribution.
"The Debit Account"
Oliver Onions