Warriors Or Not?

A wonder: The pasuk in Vi-zos Habracha says that Moshe blessed Shevet Levi  that ברך ה' חילו ופעל ידיו תרצה מחץ מתניים מקמיו ומשנאיו מן יקומון - They are going to rip their enemies into pieces. Rashi says that this is alluding to the Chashmonaim who were Kohanim from Shevet Levi and took 'good care' of the Greeks.

The Rambam learns [at the end of Shmittah Vi-Yovel] from the SAME PASSUK that Shevet Levi doesn't go out to war....

Hmmmmmmmmm.

What do you think?