The Army's ideas weren't problematic, even if you idly pondered how a sow could climb a tree. As long as it didn't affect anyone else, it wasn't an issue. As for the most basic question of "whether it could be done," whether or not others believed it, the upper echelons of the Army believed they could achieve a grand victory.
"Our Royal Army's fighting spirit is the best in the world!"
"Our Royal Army's training level is the best in the world!"
"Our Royal Army's combat experience is the best in the world!"
"Our Charlemagne magic engineering level is the best in the world!"
"I'm not targeting anyone specifically, but I want to say, everyone present is trash!"