I've heard of the "Night of the Long Knives" before, but only ever described in an ominous and vague way that made it sound like it involved rounding up everyone in the government and military who opposed him or wasn't 100% on board with his rise to power and having them murdered, possibly in a single literal night. An "Order 66" moment, if you will.The historical context of HItler and the German armed forces - hopefully others will find it illuminating too.