How can you kill a medieval knight?

Answer 1

One obvious way to kill a knight was with another better trained knight.

Bows, crossbows, javelins and other projectile weapons were a severe weakness of any close combatant, one key reason why they adopted the use of expensive heavy armour.

One way to kill a knight in close combat is to use weapons not in his range, for example a knight using a longsword (a two-handed blade) is less effective in tight areas than a knight with an arming sword (single-handed sword) or better still one using a dagger.

If the opponent was using a sword, then a polearm would outrange that and keeping distance would ensure victory, whilst an opponent with a polearm would struggle in the range that an arming sword uses.

Siege weapons such as trebuchets, ballistae and cannon were also effective long term against defending knights.