I'm sure that the Nazis used plenty of coercion to find warm bodies for the front lines, but from most of the available accounts, German soldiers were for the most part fully on board with the Nazi ideology and only distanced themselves from Hitler after they started losing battles. The army was perfectly happy to comply with all of Hitler's orders when things were going well for them, but after the tide had turned they needed a scapegoat to explain why they were getting whipped so badly.