The search results indicate that soldiers on both sides of a conflict might use caves on Aerok Hill for similar purposes as those depicted in the 2011 South Korean film "The Front Line," where both sides are ordered to capture and hold territory, which determines the final border between the two nations. In the context of trench warfare, as described on Wikipedia, soldiers would dig deep into the ground to break up enemy attacks and protect their own troops. This suggests that caves could serve as natural fortifications, providing cover from enemy fire, a place to store supplies, or even as a base for launching attacks. However, without specific details about the cave on Aerok Hill, these are general uses that soldiers might have for caves in a war setting. For more precise information regarding the cave's usage in the particular scenario you're interested in, additional context or sources would be needed.