From A Wiki of Ice and Fire
Grand Defiance was a Braavosi dromond of four hundred oars. The massive ship was the pride of the Sealord of Braavos.
During Lord Alyn's attack on the Braavosi fleet during the Daughters' War, Grand Defiance fought past six Velaryon ships to gain the open sea beyond the Stepstones. Lord Alyn Velaryon's flagship, Queen Rhaenys, struck the dromond's side with its prow "like a great oaken fist", however, cutting it in two. Grand Defiance quickly sank when Queen Rhaenys rowed away. The sinking of the dromond gave Alyn the nickname of Oakenfist.
- ↑ 1.0 1.1 Fire & Blood, Under the Regents - War and Peace and Cattle Shows.