Time War: Invasion

Time War: Invasion - Nick S. Thomas A decent sci-fi yarn follows the last surviving members of a unit as they try to stop the evil genius behind the war.
That is, until he sends himself back in time to World War 2. The heroes try to follow him back, and end up with the allies but history is slightly different.

It's not very original, but the characters work, there's good action and suspense throughout that definitely make it worth a read.
Will be keeping an eye out for book 2 in the series.