During the siege of Caerlaverock Castle, 60 Scottsmen held off 3000 English men along with about 87 English knights. It is also one of the most exquisite castles in that it is triangular. If you ever are in Dumfries, you must see it: http://www.techandfacts.com/caerlaverock-castle-scotland/
Edit: This poem from one of the king's heralds detailing the battle is incredible: https://fourteenthcenturyfiend.com/2017/02/03/the-siege-of-c...