MySQL won't use a composite index unless it uses the first "n" fields in the index.
As Alnitak points out, the question is how your indexes are defined. One index is probably not enough, if you want fast access on these logs.
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.