There are detailed sources for the previous decade or so, mostly in the letters and speeches of Cicero.
This is a detailed source for Jordan in the Cuban Ten Year War.
The most detailed sources on the battle, the kings' sagas, were written approximately two centuries after it took place.
Pepys' diary provides a detailed primary source for Montagu's career in the 1660s.
A detailed source of information regarding Desmond Pacey's life and works.
His diaries from 1935 to 1939 provide a detailed source of information on the worsening situation of Düsseldorf's Jewish community.
He is the most detailed and accurate source for the Battle of Torà in 1003.
The early detailed source, the Germania of Tacitus, has sometimes been interpreted in such a way as to provide yet other historical problems.
The difference between this "low-end" figure and other estimates can be explained by the lack of exact and detailed sources on the deportations statistics.
These exchanges can be immensely valuable, but both sides may feel the need to sanitize detailed sources.