Tianlong Yun led the arrow of soldiers behind him directly to the entrance of the heavy armoured army, while attacking their heavy shields.
The attacks created a lot of noise, so much that it almost deafened the soldiers behind them, and even scared the horses his own army was riding, but it didn't really cause damage.
It was great to create noise for the following army though, whose General had his teeth on the ground from laughing hard in happiness.
After all, with his actions this 'lunatic' King had chosen a path of no return, and he had no other option but to wait for his death, which would be following behind.
By the time they approached enough to understand what was going on, they only managed to see that the lunatic King was leading his army through the traps field.