Assault on the power grid

Grenada Reconquest- Angel's Wrath Raids- Iberia-  A squad of Vanguard Veteran marines of the Apocalypse Angels chapter takes on Stygian guardsmen  and Dark mechanicus forces guarding a power distribution center.  The ensuing destruction of the center left darkness and confusion across a section of Iberia.  This was something the follow on Imperial invasion force was able to take advantage of as they made planetfall later.