[Our forces do not have a defensible position. Even with {Rewind} and {Limitless}, it is impossible to kill everything faster than they could overwhelm us. This goes for both you, my lord and the ladies.]
I knew this truth well. When I didn't have the 2nd Amendment nor Hellsend, I often was mobbed close to death. No matter how many bullets or guns you had, if a hundred enemies came for you every second, you will get overwhelmed. Period.
Human wave tactics, the core tactic of the ancient world was to simply throw bodies at your enemies till you won. While most militaries tried to avoid it, baring the staggering loss of human life, it was brutally effective.
No matter how adept or advanced an army was, if they were not allowed to rest, they would lose. People would get tired and begin to make mistakes. Injuries would pile upon on top of each other. Even armor would eventually start to fail given enough hits.