They’re SAS.
They don’t need supply lines. As they take out targets, they repurpose whatever is usable.
Only if they are 100% successful in taking out intentional targets.
This isn't an action hero movie with a scripted ending. This could easily turn into a "Custer's Last Stand"
However, if you're so confident then get your A$$ over there join them
Thanks in advance... We all appreciate your sacrifice.