Gao Yang was indeed planning a night raid; attacking Teodulo's camp with inferior firepower and personnel was essentially a death wish.
If Teodulo's men were not complete idiots shooting at the sky, a firepower network of over a hundred men would definitely hold an absolute advantage. Gao Yang and his team were not superheroes, getting hit by a bullet in a vital spot meant certain death. Even the most elite troops facing such circumstances would only choose to execute a quick, accurate, and fierce assault, killing the target rapidly and then swiftly withdrawing. Thus, a night raid was almost an inevitable choice.
For a night raid, it was best to approach the target as close as possible without alerting the enemy beforehand, which made silent or suppressed weapons very important.
