In the final battle, the book says:
As for his own fleet, it consisted of twenty starships, each with only four fighters. He knew the four-fighter starships they were old-fashioned, sluggish, and the range of their Little Doctors was half that of the newer ones. Eighty fighters, against at least five thousand, perhaps ten thousand enemy ships.
Where are the other, newer ships, which were used in the previous battle? Why does the I.F. use old-fashioned, sluggish ships in such an important battle?