https://en.wikipedia.org/wiki/List_of_Allied_warships_in_the_Normandy_landings#Battleships Seven battleships took part: four British and three US: USS Arkansas USS Nevada HMS Nelson HMS Ramillies HMS Rodney USS Texas HMS Warspite Let's triple that number to 21 battleships: Per Wikipedia, in 1943 the British battleships Revenge and Resolution were recalled to Britain and decommissioned. Followed in Jan 1944 by Royal Sovereign. If we can hold off on the latter's handover to the Soviets we can add these three battleships. Now we need 18 more. Just imagine the site of 21 battleships firing onto German positions. Here at Iowa Jima there were eight battleships.