The campaign map identifies Cadia as an obvious target before the main force advances toward Nemesis Tessera. The visible route may not be the sector's only entrance, so ships cover the likely approach instead of joining the advance. An estimated enemy strength of about six hundred faces roughly eight hundred in the covering force, a margin judged sufficient. The fictional geography and values illustrate a recognizable use of a reserve: protect a decisive base and likely avenue of attack while another force conducts the advance.
Notable Point · 34:19-35:50
A reserve fleet covers the likely approach to Cadia
Before the advance, ships remain near Cadia because the important base may have another approach that an enemy force could exploit.