He isa fellowof a most arrogant and invincible dullness,I assure you.

-Jonson, Ben
  Bartholomew Fair, act1, sc.1.

Love invincible in battle.

-Sophocles
Antigone,781^90 (translated by H Lloyd-Jones,1994).

History shows that there are no invincible armies.

-Stalin,Joseph originally Iosif Vissarionovich Dzhugashvili
  Radio broadcast, 3 Jul, announcing the declaration of war against Germany, three weeks before Hitler invaded.

Indeed the arguments on both sides were invincible; for in reason, all government without the consent of the governed is the very definition of slavery; but in fact eleven men well armed will certainly subdue one single man in his shirt.

-Swift,Jonathan
  Fourth letter to†Ireland, written under the pseudonym of 'M B Drapier'.