ὅτι ἐγενήθης ἐλπίς μου, πύργος ἰσχύος ἀπὸ προσώπου ἐχθροῦ.

1. ὅτι
   that
   because
2. ἐγενήθης
   you became
3. ἐλπίς
   hope
4. μου
   my
5.  
   ,
    
6. πύργος
   tower
7. ἰσχύος
   strength
8. ἀπὸ
   from
9. προσώπου
   face
10. ἐχθροῦ
    enemy
11.  
    .
     

Because you became my hope, a tower of strength from the enemy's face.