Good question. 1) Millions and millions of Vanara Sena: The vanara sena and bear sena are Millions and millions in number as per Valmiki Ramayana. The number of ships required is in millions and thus not practicable!
Valmiki Ramayana, Book IV : Kishkindha Kanda, Chapter Sarga 39: Millions and millions of monkeys arrive with their troop-leaders to the control of Sugreeva. Rama's intent to wage war with Ravana is informed to Sugreeva. And Sugreeva who is interested for requital of the help rendered by Rama informs that all the monkeys on earth are ushered to remain in the service of Rama.
While Sugreeva is informing about the arrival of monkeys, in a split-second that place is further crammed up with troops and troops of monkey-warriors. Vanara Commanders: Shatabali = ten thousand crores vanaras Sushena = many thousands of crores of vanaras Taara = thousand crores of vanaras Gavaaksha = thousand crore vanaras Dhuumra = two thousand crores of bears Panasa = three crore vanaras.
I think Sri Vidya Rajgopalan has given the correct answer. But the Answer is very long. Let me explain you in short.
Ram built a Bridge instead of ship because he thought, if in the war with Ravana more army of Varana is required then it will be easy to bring reinforcement through a Bridge Than to send ship.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.