From Warhammer 40k - Lexicanum
Battleline Squads are an organizational unit in a modern post-Primaris Space Marine Codex-Compliant Chapter.
The most numerous and strategically versatile warriors in a Codex-Compliant Chapter form Battleline Squads. These are flexible enough to press home an attack or hold a position with withering firepower. Whatever the strategic challenge, Battleline Squads are equal to the task. Battleline Squads consist of the most experienced Space Marines of a Chapter outside of Veteran units, consisting of warriors who have spent time in Scout, Close Support, and Fire Support Squads.
Battleline Squad Types
- Tactical Squad
- Intercessor Squad
- Heavy Intercessor Squad
- Infiltrator Squad (assigned to Vanguard Space Marine Formations)
- 1: Codex: Space Marines (8th Edition, 2nd Codex), pgs. 68-69
- 2: Codex: Space Marines (9th Edition) pg.16