The first sentence comes from Mount Emei Pass in Qin Yi, which doesn't mean that Xiongguan Steel is as insurmountable, but now we have to conquer it from the beginning. The meaning of the second sentence is very clear, that is, face difficulties and move towards success.
These red epigrams are intended to inspire the Red Army and set an example for future generations. Loushanguan is known as a natural barrier and the environment is sinister. The Red Army was in an extremely difficult situation, but any Red Army soldier who could not defeat the hero finally defeated the enemy and won the battle of Loushanguan. As future generations, we cherish peace more, and we should also learn from the Red Army's spirit of not being afraid of hardship and fatigue.