The 9th edition brought several transformative rules that redefined how the Imperial Guard operates on the tabletop:
In the grim darkness of the far future, the Astra Militarum—known to many as the Imperial Guard—stands as the indomitable backbone of the Imperium of Man. While Space Marines may win the glory and the headlines, it is the countless regiments of mortal men and women, supported by crushing artillery and armored columns, that hold the line against the horrors of the galaxy. Astra Militarum Codex 9th Pdf
for the latest FAQ and Errata to ensure your rules are accurate. Regimental Doctrines: The 9th edition brought several transformative rules that
Three unique Guard secondaries: