The direction where Ling Lan and her comrades were heading wasn't the direction that Base Nebula took. It wasn't where King Muqi and Falling Snow were too. It was where the 23rd division was.
The 23rd division was currently fighting with two divisions of Caesar.
The number of casualties of the 23rd division suffered in this unfortunate encounter was one of their highest recorded rates of casualty ever since they were formed. However, the Zaoyi Army and the Hejia Army were in an even worse state. Even when they had the advantage of numbers, they were unable to finish off a relatively new division that was created for less than ten years. This was unexpected. Their number of casualties was more than twice that of the 23rd division.