Armistice Line

The Armistice Line on Galactica's DRADIS (Hero

The Armistice Line is the border between Cylon and Colonial territories, drawn out by the Cimtar Peace Accords.

One year prior to the Fall of the Twelve Colonies, Commander William Adama of battlestar Valkyrie was ordered by Admiral Corman on a secret mission to reconnoiter Cylon space in order to evaluate the scope of their potential military operations. To do so, Adama sent Lieutenant Daniel Novacek in a stealth ship over the Armistice Line, where Novacek was intercepted by a lone Cylon Raider.

In a vain attempt to cover up the trespass, Adama fired a ship-to-ship missle at Novacek, who ejected from the craft prior to its destruction and was subsequently captured by the Cylons.

Up until the time of Novacek's return after the Second Exodus, Adama believes that this trespass lead to the Cylon attack against the Colonies (Hero).

It's likely that Cylon agents had been violating the armistice line for some time prior to Adama's transgression.