Science Fiction book I read years ago. Two ships are locked in a space battle constantly testing their faster than light drives. Go back in time to present day Earth.

[Thomas]

This book was about two ships locked in a space battle constantly testing their faster then light drives until breaking past a certain point. This resulted in these far future space craft going back in time to present day earth.

Iv tryed looking up the plot in google to no avail so hoping some one can recall this plot.

[Jack]

Soulds like the beginning of:

The Apocalypse Troll

[Kris]

Wikipedia's plot summary (with Spoilers) of The Apocalypse Troll by David Weber - Jack's suggestion:

- https://en.wikipedia.org/wiki/The_Apo...

Google Books preview:

- https://books.google.com/books?id=Xql...
- There are different cover images.