I mean, what you're describing is every non-military mercenary (ie, a sellsword/bodyguard/what have you) ever. The weird preconception of 'commandos' as some kind of unique, superhuman supersoldier is pure Hollywood. Staying alive doesn't change. People didn't runn screaming at eachother in Ye Olden Days just because they lacked guns.
Also, they didn't lack guns.