you were a well recognized commissar for your brilliant tactics using heavy artillery to destroy the enemy instead of feeding your troops into the meat grinder. You were task to lead a campaign against the Orks by Angron's side. Angron disliked your tactics, your tactics slowed the crusade down and he wasn't the type to stay behind and not charge in. It has always been awkward and violent between you two, he didn't see value in the lives of the troops, while you did your best to protect them