The Ammonite warriors fight valiantly. They had been bloodied before, so they were now not inexperienced, but they were still fighting in a battle that appeared to be lost until the miraculous appearance of the unexpected return of the men who had been guarding the prisoners. In spite of fighting in what appeared to be a losing situation, they still fought bravely.
Helaman does tell us that there had been some training going on, because he indicates that they “did obey and observe to perform every word of command with exactness.” Military units must know how to fight in a coordinated fashion, and Helaman had taught his young men the things they needed to know to be effective. Part of their effectiveness was that they did follow the commands. This would indicate that they were fighting as a unit rather than as individuals, and that increased their relative strength. A coordinated unit is much more devastating that a similar number of individuals that are not well coordinated.