The only altercation I was ever involved with that included a soldier was at an Army nco club.
A drunk army sgt spilt his beverage and knocked the beverage out on the hand of a fellow marine... He proceeded to be relieved of the funding for replacements by force as his entire squad looked on.. The 6 marines present stood to assist since we were outnumbered 25 or more to 1!
Not a single soldier moved, not even to help him up from the floor...
Now if that were to have been reversed and on a marine base, the 6 soldiers would have been in the hospital or the brig..
A marine can do wrong, but a marine will correct. If a marine does wrong and a member of another service were to try that, you handle him first then you resume corrective action.....