The rallying cry of the crusaders was Deus lo volt — God wills it!:
The Classical Latin is Deus vult, not Deus volt, or Deus Lo Volt, from the irregular Latin verb volo, velle, volui. Deus Lo Volt is a corruption of this. In The Decline and Fall of the Roman Empire, Chapter LVIII: The First Crusade, Edward Gibbon explains this corruption:
Deus vult, Deus vult! was the pure acclamation of the clergy who understood Latin…. By the illiterate laity, who spoke the Provincial or Limousin idiom, it was corrupted to Deus lo volt, or Diex el volt.